MDC OFF-GRID extreme XT12HR Owner's Manual

Offroad travel trailer 2025

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OWNERS MANUAL

2025

XT12HR OFFROAD TRAVEL TRAILER

OFF-GRID EXTREME EDITION

IN ASSOCIATION WITH

1-833-632-8721

www.marketdirect.com.au

1300 494 494

PA G E

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Page 1 OWNERS MANUAL 2025 XT12HR OFFROAD TRAVEL TRAILER OFF-GRID EXTREME EDITION POWERED BY IN ASSOCIATION WITH 1-833-632-8721 www.marketdirect.com.au 1300 494 494 PA G E Copyright © Market Direct Group Pty Ltd 2025 All Rights Reserved...
Page 2: General Information
(collectively, “MDC”), and may not be duplicated, copied, modified, or adapted, in any way without our written permission. This Owner’s Manual may contain MDC service marks or trademarks as well as those of MDC affiliates or other companies, in the form of words, graphics, and logos.
Page 3 DEALER: DISCLAIMER: By receiving this handbook, you confirm there you have read and agree to all the terms and conditions and understood the use and maintenance care of MDC Campers and Caravans Inc. P a g e www.mdcusa.com Ph: 1-833-632-8721...
Page 4: Table Of Contents
Table of Contents Towing & Load Management..............18 Terminology & Abbreviations ............. 18 General Information..................1 Achieving a Safe Towing Combination..........19 Table of Contents ................... 3 Trailer & Tow Vehilce Tire Pressures ..........19 General Safety Information ............... 6 Trailer Tire Pressures ...................19 Safety Alert Symbols and Signal Words ..........
Page 5 Shock Absorbers & Bushes ............... 37 Changing Battery Heater Settings ............54 Wireless Rear-View Camera ..............38 Storage & Maintenance ................55 Troubleshooting the Rear-View Camera .......... 38 Turning Off the Battery for Long-Term Storage ......55 Charging the Caravan ................39 Battery Maintenance ..................56 Grid Power ......................
Page 6 Propane Certification................... 75 Winterizing Your Trailer ................. 91 General Propane Safety ................75 Prepare the Trailer for Winterizarion ..........91 Gas Cylinder Safety ..................75 Drain the water system ................91 Propane Appliance Safety ................75 Bypass the Water Heater ................91 Ventilation and Flues ..................75 Introduce RV Antifreeze into the Plumbing System ....92 Isolating Appliances ..................
Page 7: General Safety Information
If you believe that your vehicle has a defect that could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying MDC Caravans and Campers INC.
Page 8: Modifications To The Product
The industry optimum tongue weight on a caravan is between 9 and 11% of the total trailer weight. MDC trailers fit into this category and 10% should be used as the starting point.
Page 9: Fire Safety
Fire Safety Ventilation Do not obstruct any permanent ventilation in this camper/trailer including annex attachments. Precautions Do not leave children or pets alone in the camper/trailer. Combustible Materials Keep all combustible materials away from: • Ovens and cooktops • Hot water heater •...
Page 10: Button/Coin Battery
Button/Coin Battery Some MDC models are fitted with remote wireless switches for lighting. These switches contain “Button/Coin Battery” that are harmful or fatal when swallowed. DO NOT allow children to play with these switches or leave unattended in the vicinity of these switches.
Page 11: Tire Safety & Maintenance
Tire Safety & Maintenance This section of the User Manual contains tire safety information as required by 49 CFR 575.6. Determining Correct Load Limit Trailers 10,000 Pounds GVWR or Less 1. Locate the statement “The weight of cargo should never exceed XXX kg or XXX lbs” on your vehicles placard. See figure 1-1 2.
Page 12: Checking & Maintaining Proper Tire Pressure
• Improve fuel economy. • Increase the life of your tires. This booklet presents a comprehensive overview of tire safety, including information on the following topics: • Basic tire maintenance • Uniform Tire Quality Grading System • Fundamental characteristics of tires •...
Page 13: Tire Size
• Step 3: If the tire pressure is too high in any of the tires, slowly release air by gently pressing on the tire valve stem with the edge of your tire gauge until you get to the correct pressure. •...
Page 14: Understanding Tire Sizes & Treadware Ratings
Understanding Tire Sizes & Treadware Ratings Information on Passenger Vehicle Tires The “P” indicates the tire is for passenger vehicles. Next number This three-digit number gives the width in millimetres of the tire from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire.
Page 15: Additional Information On Light Truck Tires
Temperature Letter This letter indicates a tire’s resistance to heat. The temperature grade is for a tire that is inflated properly and not overloaded. Excessive speed, underinflation or excessive loading, either separately or in combination, can cause heat build-up and possible tire failure.
Page 16: General Trailer Care And Maintenance
General Trailer Care and Maintenance Protection of Finishes Paint The paint coatings on your trailer are no different to that of your car in that they need regular care and maintenance. Rubber seals and applied sealants on trailers can shed polymers and pigments that can stain paint finishes if your trailer is not washed regularly.
Page 17: Shade And Screen Care
Shade and screen care • Do not close blinds while the window is open. Air pressure can dislodge the blind material from its guide damaging it. • Always open and close blinds and screens carefully and evenly with two hands ensuring screens and blind material feeds evenly through the guides.
Page 19: Towing & Load Management
Towing & Load Management Terminology & Abbreviations Tongue Weight: The downward load exerted on the tow point of the vehicle by the trailer. Dry Weight: The total weight of the trailer (load on tires plus tongue load) with all options and fittings as supplied by the manufacturer, with empty water tanks, excluding fluids not essential for operation on public roads, and without luggage or personal effects.
Page 20: Achieving A Safe Towing Combination
Tow vehicle and Trailer Compatibility Your tow vehicle manufacturers have applied a maximum towing capacity to the vehicle which is the Gross Vehicle Weight Rating (GVWR) and a maximum Gross Combination Weight Rating (GCWR). These specifications MUST NOT be exceeded. It is your responsibility to know, understand and follow these specifications. Vehicle manufacturers may also specify or recommend “Weight Distribution Bars”...
Page 21: Load Placement
Load Placement Where you place the items in your trailer will affect how it behaves. Loading too much weight in the extremities of the trailer can have an unbelievably adverse effect. MDCUSA owner manuals have a loading guide to assist in this area. By following the guide and tongue weight recommendations you will achieve the best possible result.
Page 22: Maximum Weight Limits
Maximum Weight Limits The following is an outline of the ratings that will be specified by the manufacturer of your vehicle and the trailer manufacturer. These MUST be followed in conjunction with previously mentioned criteria for safe handling. None of the maximum ratings may be exceeded.
Page 23: Gawr (Gross Axle Weight Rating)
GAWR (Gross Axle Weight Rating) This is the maximum load on an axle specified by the tow vehicle manufacturer. It is possible to have your vehicle and trailer within GVWR and GCWR load limits but above the axle load limit specified. Ensure that this is not exceeded. Summary of Weight Ratings The above will assist in tuning or troubleshooting handling problems with your towing combination but are not the sole influences.
Page 24: Tuson Electronic Stability Control System (Tsc-1000)
Tuson Electronic Stability Control System (TSC-1000) As an added safety feature, your MDCUSA travel trailer is fitted with a Tuson TSC-1000 electronic stability control system. This is an asymmetric braking system that uses onboard measuring instruments to determine which wheel brakes to apply, and how often, to increase the stability of your caravan while driving.
Page 25: Troubleshooting The Tsc-1000
Troubleshooting the TSC-1000 The TSC-1000 is self-diagnosing and in the unlikely event that you need to troubleshoot your unit, identify this module, and determine the series of lights displayed. Refer to the below, Table 1, to identify the status of the unit. LIGHT ACTION CONDITION CORRECTIVE ACTION...
Page 26: Vehicle Electrical Requirements
Vehicle Electrical Requirements Brake Controller In the USA, installing an electric brake controller on the tow vehicle is a legal requirement for all MDCUSA RVs. This controller ensures that the trailer’s electric brakes engage proportionately during braking, thereby improving vehicle stability and reducing stopping distances for enhanced towing safety.
Page 27: Understanding Alternator Types
Understanding Alternator Types An alternator is a crucial component of a vehicle's electrical system, responsible for generating electrical power and maintaining battery charge while the engine is running. Modern vehicles are equipped with either fixed voltage (traditional) alternators or variable voltage (smart) alternators. Understanding the differences between these two systems is crucial for ensuring compatibility with your caravan’s electrical requirements.
Page 28: Vehicles With Or Without Smart Alternators
The Renogy 50A Dual Input DC - DC on-board battery charger with MPPT fitted in your MDC trailer is programmed to prioritise solar panel power exclusively until it drops below an output current of <25A. By providing accessory power to the number 4 pin of the trailer...
Page 29: Towing Your Travel Trailer
Towing Your Travel Trailer Weights and Payload Capacities The information plate attached to the drawbar of your trailer displays the relevant weights and weight capacities of the van. How to Load Your Trailer It is important to load your RV correctly to distribute weight evenly and achieve a suitable tongue weight load and prevent loading in a manner that can cause a trailer to sway and/or roll excessively left and right.
Page 30: Tire Pressures
Tire Pressures Tire pressures have a large effect on the handling of your travel trailer. Tires that are under the recommended pressure for the travel trailer’s actual weight can cause a dangerous sway. It is important to follow the correct pressure guide. The guide below indicates pressure for the GVWR which includes tongue weight of 10%.
Page 31: How To Hitch Your Coupler
How to Hitch your coupler The following steps outline how to safely use your coupler to couple and uncouple the trailer from the towing vehicle. Preparation Make sure the handbrake is applied prior to coupling and uncoupling. Make sure the dust cap is securely connected to the bump cover. This is done by locating the rear lip on the dust cap onto the groove of the bump cover and then pushing it in a downward motion until the dust cover is secure (there should be a slight click when it has been assembled correctly) Test if the dust cover is connected to the bump cover by applying a slight upward force to the dust cover, it shouldn’t separate.
Page 32: Coupling
Coupling STEP 1 Push down the button (1) and push the locking mechanism back (2). When the locking mechanism (2) is all the way back, release the button (1) locking the plate in place. STEP 2 Offer up the tow pin to the coupler making sure the tow pin cover is removed and there is no visible debris on it. Locking plate should be in unlocked position as shown.
Page 33: Uncoupling
Uncoupling STEP 1 Push down the button 1 and push the locking mechanism back 2. When the locking mechanism is all the way back release the button while holding the mechanism to ensure it does not spring back to the locked position. STEP 2 Lift the coupler up off the tow pin.
Page 34: Emergency Breakaway System
Emergency Breakaway System The emergency breakaway system on your MDC USA trailer is a crucial safety feature designed to automatically engage the trailer’s brakes if it detaches from the tow vehicle. This system helps prevent uncontrolled movement, reducing the risk of accidents or damage.
Page 35: Connecting The Safety Chains
Connecting the Safety Chains Chains should be crossed over and connected with suitable rated shackles. Ensure they are connected in a way to prevent them dragging on the road but not too tight as to restrict the articulation of the vehicle and trailer combination. Connecting the Electrics When connecting ensure the electric cables to your tow vehicle cannot drag on the road or foul the coupling.
Page 36: Braking Systems
Braking Systems Hand Brake Parking brakes are mechanically operated by cable means. The cable attachment occurs outside of the brake backing plate. Cable force applied to the parking lever creates a torque through the pivot pin and cam assembly. Torque transferred to the parking cam results in a spreading force between the primary and secondary shoes.
Page 37: Correct Use Of Your Electric Brakes
If at all in doubt, please refer all repairs and maintenance to a suitably qualified or experienced mechanical repairer. • MDC Campers and Caravans Inc. accepts no liability for personal injury, loss or damage resulting from incorrect applications, methods, and failure to perform maintenance safely and correctly.
Page 38: Shoes And Linings
It is also recommended that the drum armature surface be refaced when replacing magnets. Magnets should also be replaced in pairs - both sides of the axle. Always use genuine MDC OEM parts. Shoes and Linings A simple visual inspection of your brake linings will tell if they are useable.
Page 39: Wireless Rear-View Camera
Wireless Rear-View Camera A wireless rear-view camera has been factory fitted on the rear of your trailer. The unit is connected to your trailer's parking light circuit, allowing the camera to be used when reversing. Activate the camera by turning your vehicle lights on. To use the system: 1.
Page 40: Charging The Caravan
5. Uncoil the power cable of the monitor – this may cause electromagnetic interference excessive 6. If still unsatisfactory contact MDC (warranty team to escalate to MDC compliance pixelization team internally) Table 4 For more information, refer to the camera system instruction manual provided.
Page 41: Travelling During Winter
Travelling During Winter Winter camping in your trailer can be a magical experience, offering serene snowy landscapes and the thrill of activities like skiing. However, it also presents unique challenges that require careful planning and preparation. In this section, we'll explore key aspects to consider for a safe and enjoyable winter adventure, ensuring your RV remains cozy and functional even in the coldest conditions.
Page 42: Switching To Lp Gas Mode
Switching to LP Gas Mode 1. Remove the access door. 2. Switch OFF the Truma AquaGo at the POWER switch and at the control panel (set Operating mode to OFF). 3. Remove the plug from the flue duct and clamp it beneath the holder.
Page 43: Trailer Set Up & Operation
Trailer Set Up & Operation Setting Up the Trailer Finding a Suitable Spot When choosing a spot to set up your travel trailer, start with a flat area with no overhanging trees. Birds and bats occupying trees can defecate leaving droppings on your trailer that can damage paint and leaves and sap can also stain the coating. Ensure you are not camping in an area prone to flooding or with bad drainage in the event of rain.
Page 44: Electric Cassette Awning
Electric Cassette Awning When extending the awning always support to front as it extends. Do not allow the awning to carry the full extended weight as this may damage the hinges. Support the end manually by hand or by using the extendable legs. Never allow water to pool on the awning, during rain lower one side to a level that allows the water to freely run off and not pool.
Page 45: Electrical Systems & Safety
Electrical Systems & Safety General Electrical Safety Failure To Follow These Instructions May Result in Death or Serious Injury! • When working with electrical equipment or lithium battery, have someone nearby in case of an emergency. • Study and follow all the manufacturer’s specific precautions when using and servicing the battery and connected appliances.
Page 46: Low Voltage (110-120Vac) Power System
Low Voltage (110-120Vac) Power System Mains/Shore Power MDC Caravans are built with an integrated 110-120V Alternating Current (110-120V AC) power system for charging the battery and running appliances, such as the onboard inverter, air conditioner, and other devices like laptop chargers, televisions, and toasters. The primary power source for this system is via an external power connection from the continental U.S.
Page 47: 120Vac Overload Protection
120VAC Overload Protection Your RV is equipped with 120V AC circuit protection to prevent electrical overloads, short circuits, and ground faults. This protection includes main circuit breakers, branch circuit breakers, and GFCI-protected receptacles to ensure safe operation whether powered by shore power or the inverter. Main Circuit Breaker &...
Page 48: Automatic Ac Power Transfer
Automatic AC Power Transfer The Renogy REGO 3000W HF Inverter-Charger is equipped with an automatic AC transfer switch that seamlessly switches between shore power (120V AC) and inverter power to ensure continuous operation. • When shore power (30A) is available and stable, the inverter-charger prioritizes shore power and routes it back to the WFCO AC Distribution Panel to supply power to all AC circuits.
Page 49: Extra Low Voltage (12Vdc) Power System
Extra Low Voltage (12Vdc) Power System Distribution Switchboard Control Panel Located in overhead cabinets this panel is the primary location for the 12Vdc power system. It houses the main rotary isolator switch for all non-constant 12Vdc loads on the battery, rocker switches to control the various circuits throughout the caravan and mini circuit breakers protecting these circuits.
Page 50: 12Vdc Overload Protection
12VDC Overload Protection High Load Primary ANL Fuses The 12VDC overcurrent protection is provided by ANL fuses, housed in the electrical compartment under the dinette seats. These fuses protect the system from excessive current and must be manually replaced if blown. Your XT12HR OGE system includes the following ANL fuses: •...
Page 51: Single-Use Blade Fuses (1A-30A)
• Always replace with a breaker of the same amperage rating to maintain proper circuit protection. Single-use Blade Fuses (1A-30A) • Located within in-line fuse holders in the primary battery bank circuit breaker compartment. • Used for constant power circuits, including: 1.
Page 52: Lithium Battery System
Lithium Battery System Battery Safety & Handling FIRE, EXPLOSION, OR SHOCK HAZARD • Do not expose battery to flames, sparks, or excessive heat. • Do not puncture, drop, crush, or dismantle the battery. • Do not connect or disconnect battery terminals while under load—turn off all loads first to prevent arcing and damage. •...
Page 53: Battery Activation & Initial Use
Battery Activation & Initial Use Upon delivery of your trailer, the lithium battery in the XT12HR OGE may be turned off and in a low-power state designed to preserve charge during storage. Before first use, follow the steps below to properly turn on and activate the battery. Turning the Battery On for Use 1.
Page 54: Checking Battery Status
If a battery fails to wake up, verify that it has not been fully discharged below its safety cutoff. If necessary, apply a low-current charge (such as a trickle charge from solar or a DC power source) for several minutes before attempting to power it on again. If the battery remains unresponsive, refer to the troubleshooting section or consult the Renogy support team.
Page 55: Changing Battery Heater Settings
Changing Battery Heater Settings Your battery leave the factory with the heater enabled by default. The heater can be manually enabled or disabled using the Power Button. Enabling or Disabling the Heater • Enter Heater Setting Mode 1. Press and hold the Power Button for 8 seconds to enter the heater setting mode. 2.
Page 56: Storage & Maintenance
• The battery system is designed to operate with high-current charging sources, ensuring that the heater functions properly when required. As long as the charge current remains stable and above 15A, the heater will activate as needed to maintain proper battery temperature. There is no risk of heater cycling due to insufficient charge current, and users do not need to manually disable the heater under normal operating conditions.
Page 57: Battery Maintenance
Battery Maintenance Proper maintenance and regular inspection of the Renogy 12V Lithium Iron Phosphate (LiFePO₄) battery is essential to ensure optimal performance, longevity, and safety. Follow the guidelines below to maintain the battery system: Regular Inspection Perform routine inspections to identify and address potential issues early: •...
Page 58: Battery System Troubleshooting & Common Issues
Battery System Troubleshooting & Common Issues Issue Possible Cause Solution Press and hold the power button for 1 second. If Battery is in shelf mode or Battery will not turn on unresponsive, apply an external charge (solar, DC-DC, or deeply discharged shore power) to wake up the battery.
Page 59: Charging The Battery System
Charging the Battery System Low Voltage (110-120Vac) Charging Your MDC Off-grid Extreme edition travel trailer is equipped with a Renogy REGO 12V 3000W HF Inverter-Charger, which allows for AC power charging when connected to shore power or an AC generator. The inverter-charger automatically manages charging operations based on the battery's state of charge, ensuring efficient and safe power management.
Page 60: Extra Low Voltage (12Vdc) Charging
Renogy User Manual. Extra Low Voltage (12Vdc) Charging Your MDC Off-grid Extreme travel trailer’s electrical system is designed to efficiently manage DC charging sources, ensuring the Lithium Iron Phosphate (LiFePO4) battery remains adequately charged during use on and off-grid. The system utilizes multiple charging sources, including: •...
Page 61: Dc-Dc Charging From A Towing Vehicle And Solar (Pv) System
DC-DC Charging from a Towing Vehicle and Solar (PV) System The XT12HR OGE is equipped with a Renogy 50A Dual Input DC-DC Battery Charger with MPPT, enabling the vehicle alternator to charge the onboard lithium battery bank while also supporting solar charging via the roof- mounted solar array.
Page 62: Auxiliary Solar Panel Inputs (Offside Anderson Plugs)
The Renogy 50A DC-DC Battery Charger with MPPT uses LED indicators to display system status and alert users to potential issues. • Alternator / Charging Indicator: Indicates whether the alternator or solar input is actively charging the auxiliary battery. • Solar Charging Indicator: Shows the current charging stage when solar input is being used.
Page 63: Understanding Mppt Charging And Solar Performance
• Monitor the ONE Core Display or the DC Home app to ensure balanced charging between the roof-mounted solar system and auxiliary inputs. • If using multiple panels, ensure that each panel has its own charge controller and that the total system charge rate does not exceed battery safety thresholds.
Page 64 1. Solar Panels Do Not Always Produce Their Rated Wattage The rated power of a solar panel (e.g., 200W, 400W) is based on Standard Test Conditions (STC): • Irradiance: 1000W/m² (full sun) • Panel temperature: 77°F (25°C) • Optimal tilt and sun angle In real-world conditions, factors such as cloud cover, dust, shading, and temperature variations often reduce actual output.
Page 65: Inverter Functions Of The Renogy Rego 3000W Inverter
Inverter Functions of the Renogy REGO 3000W Inverter The Renogy REGO 12V 3000W HF Inverter-Charger is a multi-functional power management device designed for off-grid and mobile power systems. It serves three primary roles: 1. Inverter Function – Converts 12V DC battery power into 110-120V AC power, enabling the use of household appliances and electronics in your Off-grid Extreme edition trailer.
Page 66: Configuration Panel Overview
Below is an overview of key settings, their default values, and instructions for changing user-adjustable options. Factory Default Settings (DO NOT CHANGE) The following settings are preconfigured for optimal operation and should not be adjusted unless specified by MDC or an approved service provider: •...
Page 67: Use Of Appliances
To enable or disable the buzzer: 1. Locate the buzzer setting on the configuration panel. 2. Switch to "ON" to enable audible alerts. 3. Switch to "OFF" to disable the buzzer (visual LED indicators will still function). These settings ensure that users can customize their inverter experience while maintaining factory-optimized performance for reliability and safety.
Page 68: Safety Warnings
12V DC Outlets (Low Voltage DC Loads) Appliance Power Rating Supported? 12V kettle ~150W � � 12V cooker 10-15A � � Small 12V fridge ~150W � � 12V portable oven ~130W � � 12V sandwich/jaffle maker Varies � 12V diesel heaters Varies �...
Page 69: Maximizing Battery Use
Maximizing Battery Use There are several ways to extend the life and optimize the performance of your battery when camping off-grid. Proper charging configurations and power management strategies can help ensure reliable energy for your appliances and accessories. Charging While Towing •...
Page 70: Renogy One Core Energy Monitoring System
Renogy ONE Core Energy Monitoring System The Renogy ONE Core is a factory-installed, CAN bus-integrated energy monitoring and smart control system in the XT12HR OGE Off-Grid Extreme Trailer. It provides real-time power system monitoring, remote access, and smart automation through: •...
Page 71: Pairing With The Renogy Dc Home App
Pairing with the Renogy DC Home App For remote monitoring and smart control, connect Renogy ONE Core to the DC Home App. 1. On the Renogy ONE Core touchscreen go to Settings > Pair with App. 2. Follow the on-screen instructions Option 1: Standard Wi-Fi Connection 1.
Page 72: Smart Scenes & Automation
Smart Scenes & Automation The Smart Scenes feature allows automation based on energy levels, location, and temperature. Example: Custom Battery Protection Mode • Trigger: Battery SOC drops below 30%. • Action: Disable high-load appliances (e.g., inverter, air conditioner, or water heater). How to Set Up a Smart Scene: 1.
Page 73: Tv Antenna
TV Antenna All MDC travel trailers are factory fitted with a Milenco POWER 900L omnidirectional antenna. This antenna comes fitted with a high- gain, low noise amplifier which is pre-wired to all the TV antenna F- type outlets throughout the trailer.
Page 74: Truma Aventa Eco Air Conditioner System
The Truma Aventa Eco air conditioning system provides efficient cooling, dehumidification, and air circulation for enhanced comfort in your MDC XT12HR OGE trailer. The system operates via the Truma CP Plus digital control panel and remote control, offering multiple modes and adjustable fan speeds.
Page 75: Operation Via Remote Control
Risk of falling when working on vehicle roofs. troubleshooting and error codes Truma Aventa & Truma CP Plus manuals , refer to the supplied with the trailer. MDC USA Customer Service Truma’s official For additional support, contact or refer to documentation P a g e www.mdcusa.com...
Page 76: Propane & Water Systems
Propane & Water Systems Propane & Appliance Safety Propane Certification Your travel trailer has been supplied propane tested and certified. Any additions or alterations to the propane system must be performed by an authorized person and will require re-certification and testing. Also note any alterations may affect your warranty on both the system and appliances.
Page 77: Isolating Appliances
• Any supplied or 3rd party vent cover(s) (e.g., low level door vent) should only be used for covering the vents during storage between use with all LP gas system valves closed. All vents (e.g., low level door vent) shall always be uncovered when the Caravan is in use.
Page 78: Water System Overview
Water System Overview Your MDC travel trailer is equipped with a comprehensive water system, including fresh water tanks, a grey water tank, a marine-grade diaphragm water pump, a recessed wet bay for water access points, and various valves to manage water flow.
Page 79: Wet Bay
Wet Bay The wet bay is the central water management station located on the offside of your trailer. Housing the fresh water tank fillers, city water inlet, and grey tank flush inlet. It provides secure and organized access to essential water connections, ensuring easy filling, draining, and maintenance.
Page 80: Selecting The Fresh Water Tank
Selecting the Fresh Water Tank The tank selector valves allow you to control which fresh water tank supplies the system. • The valves are located beside the water pump inside the trailer. • To switch tanks, open the valve for the desired tank and close the valve for the unused tank.
Page 81: Truma Aquago Comfort Plus Hot Water System
Draining the System For instructions on how to drain the water system entirely, see Draining the Water System, under the Winterizing section of this manual Even after following the recommended draining procedure, small amounts of water may remain in the system due to: •...
Page 82: Operation Modes With Truma Cp Plus
Operation Modes with Truma CP Plus The Truma CP Plus digital control panel allows seamless management of your Truma AquaGo water heater, offering precise control over its operational modes. Use the following steps to operate the system: ECO Mode ECO mode may result in slightly longer wait times for hot water compared to Comfort mode. •...
Page 83: Using The Hot Water
Using the Hot Water • Open any hot water faucet in the RV. The AquaGo system will automatically detect the water flow and begin heating water. • Allow the water to run for a few moments to reach the desired temperature. •...
Page 84: Cleaning The Water Filter
Cleaning the Water Filter After draining the system, locate the water filter at the water inlet connection. Unscrew the filter cap carefully to access the filter. Remove the filter and rinse it under running water to remove debris. Inspect the filter for any signs of damage. Replace it if necessary. Reinsert the clean filter and securely screw the cap back on.
Page 85: Truma Aqua Go Troubleshooting
Truma Aqua Go Troubleshooting Problem Potential Cause Resolution Gas supply is turned off or inter- Check and/or turn on gas supply. rupted. Gas tank is empty. Refill/replace the gas tank. Switch on the appliance according to instructions (refer to The appliance is switched off. “Operating procedures”...
Page 86: Cassette Toilet Operation
Cassette Toilet Operation The Thetford cassette toilet system in your MDC trailer is designed for convenience and ease of use. Follow these steps for proper operation. Before Use 1. Ensure Waste Tank Readiness: • Verify that the cassette waste tank is correctly installed.
Page 87: Toilet Maintenance
Toilet Maintenance Routine Use and Cleaning 1. Before Use: • Ensure the waste tank contains at least 2 liters of water with a suitable toilet additive to aid waste breakdown. 2. After Use: • Flush the toilet as instructed using the flush button or lever. •...
Page 88: Connecting The Propane
Connecting the Propane Your trailer is equipped with a built-in propane system featuring the regulator and propane cylinder located at the front of the trailer. Always verify that propane tanks are in good condition and have not exceeded their 12-year service life, as indicated by the date stamped on the tank collar. To set up your propane system: 1.
Page 89: Propane Furnace
Propane Furnace Truma VarioHeat The Truma VarioHeat is a compact, high-performance liquid propane gas heater designed for recreational vehicles. It provides efficient warm-air heating to ensure comfort during your travels. Safety Information • Risk of explosion : Do not store or use gasoline or other flammable vapors and liquids near the VarioHeat or any other appliance.
Page 90: Maintenance
2. Allow the unit’s fan to run briefly to cool down internal components. 3. Turn off the Furnace switch at the electrical switchboard panel. Maintenance Weekly Checks • Inspect the exhaust vent and air intake for blockages. Monthly Maintenance • Clean the exterior surfaces of the unit with a damp cloth.
Page 91: Packing Down & Storage
, refer to the provided documentation Security Your trailer is supplied with an MDC engineered coupling lock device. This device is designed and manufactured to deter the theft of your new trailer. How to attach your lock to your Cruisemaster DO-35 coupling: 1.
Page 92: Winterizing Your Trailer
Winterizing Your Trailer Winterizing your travel trailer is a crucial step to ensure its plumbing system remains intact and operational during the cold winter months. When water freezes, it expands, which can cause pipes, tanks, and fittings to crack or burst, leading to costly repairs.
Page 93: Introduce Rv Antifreeze Into The Plumbing System
Introduce RV Antifreeze into the Plumbing System 1. Attach the water pump converter kit to the water pump inlet. 2. Place the free end of the siphon hose into a container or bucket of appropriate RV antifreeze. 3. Turn on the water pump to pressurize the system and draw antifreeze into the plumbing. Do not allow the water pump to run dry.
Page 94: General Troubleshooting
General Troubleshooting 110-120 Volt Electrical System PROBLEM POSSIBLE CAUSE REMEDY Shore power not connected Connect shore power Inverter not switched on Ensure inverter is powered on 120V AC system not working Faulty inverter or GFCI outlet tripped Reset GFCI and check inverter functionality Inspect and ensure transfer switch is operating Faulty automatic transfer switch correctly...
Page 95 SYMPTOM POSSIBLE CAUSE REMEDY CONTROL PANEL & ACCESSORIES No power to panel Check battery and ensure proper connection Control panel Faulty wiring or loose connections Inspect and secure all wiring connections unresponsive Tripped circuit breaker or fuse Reset circuit breaker or replace fuse if applicable Display screen Low battery voltage Charge battery to proper voltage level...
Page 96: Water System
Water System PROBLEM POSSIBLE CAUSE REMEDY Circuit breaker tripped Check and reset circuit breaker Recharge battery using onboard system or Battery depleted Pump not operating (no external charger noise) Faulty pressure switch Replace pump; contact dealer for assistance Loose corroded electrical Inspect and secure connections using a connections...
Page 97 For further assistance, reach out to your MDC dealer , watch MDC Masterclass video series on YouTube for in-depth tutorials, or contact MDC Support for expert guidance. Regular maintenance and familiarity with your trailer’s components will help ensure optimal performance and longevity.
Page 98: Mechanical & Structural Maintenance
Mechanical & Structural Maintenance Maintenance is essential to keep your trailer in a safe and usable condition. Trailers are no different to any other motor vehicle and require servicing at regular intervals which may vary according to use and the environment in which it is used. The service schedule outlines the service intervals for safe travelling and your owner obligations under our warranty policy.
Page 99: Suspension
Suspension Your trailer is fitted with quality independent trailing arm suspension with dual shock absorbers. This design is ideal for the full range of use on and offroad however, there are limitations in prolonged use of corrugated and rough road. Suspension maintenance should be done as per the schedule contained in this booklet.
Page 100: Torque Settings For Components
Behind the wheels Along the chassis Under the trailing arm Torque Settings for Components Wheel Lug Nuts Wheel lug nuts should be tightened to correct torque using a torque wrench. Never trust a “rattle gun” as these may over or under tighten.
Page 101: Spare Part Numbers
MJFCX003 14mm Wheels Stud YHJL110 14mm Wheel Nut YZCQ029 M38 Castle Nut M38 Metric LGPJ002 90mm Bearing Dust Cap (3 ³⁵/₆₄”) MDC Specific CSWH001 Wheel Bearing (Timken) 25590 Bearing Race 25590 Bearing Seal Metric 55 x 85 x 12mm 2 ¹¹/₆₄” x 3 ¹¹/₃₂” x ¹⁵/₃₂”...
Page 104: Service Schedule
Service Schedule 300mi FIRST SERVICE CHECKED • Check hitch bolts to 66ft-lbs/90Nm. Hitch • Lubricate with high temperature bearing grease. • Handbrake Inspect and adjust handbrake. • Inspect and adjust brakes. The check bearings are well greased, and the crown Brakes &...
Page 105 Every 6 MONTHS / 3,000mi SERVICE CHECKED Hitch • Check hitch bolts to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Check torque on suspension hanger bolts (140ft-lbs/190Nm). • Grease bushes and check for play.
Page 106 12 MONTHS / 6,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 107 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 108 18 MONTHS / 9,000mi SERVICE CHECKED Hitch • Check hitch bolts to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Lubricate and check bushes for excess movement. • Torque bolts to 140ft-lbs/190Nm . Suspension •...
Page 109 24 MONTHS / 12,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 110 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 111 30 MONTHS / 15,000mi SERVICE CHECKED • Inspect for damage and lubricate. Hitch • Check hitch bolts to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Lubricate and check bushes for excess movement. •...
Page 112 36 MONTHS / 18,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm . Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 113 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 114 42 MONTHS / 21,000mi SERVICE CHECKED • Inspect for damage and lubricate. Hitch • Check hitch bolts to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Lubricate and check bushes for excess movement. •...
Page 115 48 MONTHS / 24,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 116 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 117 54 MONTHS / 27,000mi SERVICE CHECKED • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Lubricate and check bushes for excess movement. •...
Page 118 60 MONTHS / 50,000KM SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 119 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 120 66 MONTHS / 33,000mi SERVICE CHECKED • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Lubricate and check bushes for excess movement. •...
Page 121 72 MONTHS / 36,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 122 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 123 78 MONTHS / 39,000mi SERVICE CHECKED • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Handbrake • Check the cable and adjust if necessary. Hand winch • Check brake function and webbing. • Torque bolts to 140ft-lbs/190Nm . •...
Page 124 84 MONTHS / 42,000mi SERVICE CHECKED Chassis and Suspension • Inspect for damage and lubricate. Hitch • Check bolt Torque to 66ft-lbs/90Nm. Jockey Wheel • Inspect for condition and operation. • Check for correct operation. Breakaway • Inspect the lanyard and clip. Drawbar •...
Page 125 Window Blinds • Inspect and adjust tension where necessary. Damp Check • Inspect caravan for any dampness. Plumbing Hot Water • De-scale hot water service. System • Water Tanks Treat tanks and entire system with bacteria killing tank cleaner and flush. Grey Water Tank •...
Page 126: Warranty Policy & Coverage
MDC. MDC shall not be liable, (in part or whole) for any warranties, either express or implied, made by agents or resellers on behalf of MDC without the knowledge or express written permission of MDC.
Page 127 4. LIMITED WARRANTY FOR TENTS Tents are guaranteed by MDC to be in new condition and without flaws or defects at the time of purchase by you, general wear and tear excepted and excluding any other Limited Warranty exclusion as set forth herein.
Page 128 To the maximum extent permitted by applicable law and unless specifically stated in writing at the time of auction, any Products sold at auction by or on behalf of MDC shall carry no warranty, whether express, implied or statutory, and shall be sold “as is.”...
Page 129: Limitation Of Liability
AND REGARDLESS OF WHETHER OR NOT ALL OTHER REMEDIES HAVE FAILED OF THEIR ESSENTIAL PURPOSE. UNDER NO CIRCUMSTANCES SHALL MDC PARTIES BE LIABLE TO YOU OR ANY OTHER PARTY IN CONNECTION WITH ANY PRODUCT FOR DAMAGES IN EXCESS OF THE PURCHASE PRICE PAID FOR THE PRODUCT WITH RESPECT TO WHICH THE CLAIM RELATES.
Page 130: Appendicies
Appendicies Recommended Accessories Enhancing the functionality and longevity of your MDC trailer can be achieved with the right accessories. Below are essential items that improve safety, stability, and protection for your travel trailer. Leveling Blocks Leveling blocks are essential for properly setting up your trailer on uneven ground.
Page 131: Essential Recovery Equipment
Available in various sizes, colors, and tread patterns—choose a set that fits your trailer’s weight and terrain needs. High-Lift Jacks & Shovels • MDC trailers come equipped with chassis-mounted jacking points—a high-lift jack can assist in lifting the trailer when dealing with uneven terrain. •...
Page 132 • Includes plugs, reaming tools, and adhesive solutions for minor punctures. • Reusable for multiple repairs, making them a great long-term investment. For more guidance on off-road towing, recovery procedures, and MDC trailer compatibility, watch MDC Masterclass video series on YouTube or visit your local MDC dealer.
Page 134: Distribution Switchboard Control Panel
Distribution Switchboard Control Panel P a g e www.mdcusa.com Ph: 1-833-632-8721 ©Copyright...
Page 135: Pre-Trip Inspection Checklist
Pre-Trip Inspection Checklist Before any trip check the following Tires  Correct tire pressures.  Tires in good condition free from damage and uneven wear.  Tread is of legal and acceptable depth. Wheel Lug Nuts  Ensure lug nuts are tensioned to the correct torque using a torque wrench. ...
Page 136: Travel Record
Travel Record Your trailer service record booklet and logbook will help you keep track of miles, travels and service records. Trip Name Date Miles Start Miles Finish Cumulative Miles P a g e www.mdcusa.com Ph: 1-833-632-8721 ©Copyright...
Page 137 Travel Record continued… Trip Name Date Miles Start Miles Finish Cumulative Miles P a g e www.mdcusa.com Ph: 1-833-632-8721 ©Copyright...

MDC OFF-GRID extreme XT12HR Owner's Manual

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