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Kit Trailer Assembly Instructions
Model: 48-048-KO8, 48-072-KO8/KO12
48-096-KO8 & 60-096-KO12
Carefully read and follow the assembly instructions in this manual.
Before using the trailer, carefully read the owner's manual.
Video Assembly Instructions Available at
https://www.youtube.com/c/WestbrookTrailers
Save both manuals for future reference.
www.westbrooktrailers.com

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Summary of Contents for Westbrook Trailers 48-072-KO12

  • Page 1 Kit Trailer Assembly Instructions Model: 48-048-KO8, 48-072-KO8/KO12 48-096-KO8 & 60-096-KO12 Carefully read and follow the assembly instructions in this manual. Before using the trailer, carefully read the owner’s manual. Video Assembly Instructions Available at https://www.youtube.com/c/WestbrookTrailers Save both manuals for future reference. www.westbrooktrailers.com...
  • Page 2 Assembly instructions for kit trailers...
  • Page 3: Safety Information

    Congratulations on the purchase of your kit trailer. Thank you for choosing Westbrook Trailers. Safety Information • It is important to read and understand all the instructions. Failure to follow all assem- bly instructions may result in serious injury. •...
  • Page 4 Assembly instructions for kit trailers...
  • Page 5: Part Listing

    Part Listing BOX # 1 TIRE & FENDER (INCLUDES ITEM LIST IN THE THREE BOXES INSIDE THE TIRE BOX) ITEM# ITEM DESCRIPTION 4’ x 4’ 4’ x 6’ 4’ x 8’ 5’ x 8’ 500258 8” FENDER 500841 4.80 X 8 LRC TIRE & WHEEL 504212 12"...
  • Page 6: Assembly Instruction

    Part Listing BOX # 2 - FRAME BOX ITEM# ITEM DESCRIPTION 4’ x 4’ 4’ x 6’ 4’ x 8’ 5’ x 8’ 500254 FRONT CHANNEL 500255 CROSS CHANNEL 500256 REAR CHANNEL 500251 4’ DRIVER SIDE CHANNEL (4X4) 500297 4’ PASSENGER SIDE CHANNEL (4X4) 500252 6’...
  • Page 7 STEP 1– Stake Pocket Installation ITEM # DESCRIPTION 504471 STAKE POCKET 501073 1/4 X 3/4” HEX BOLT 501081 1/4 LOCKING NUT 1. Line the stake pocket to the pre-drilled holes of the frame and secure with ¼ x 3/4 hex bolts and ¼...
  • Page 8 STEP 3a- Frame Assembly - 4’x 4’ Kit Trailer Frame ITEM # PARTS DESCRIPTION 501049 3/8 X 3/4” HEX FLANGE BOLT 501033 3/8 X 1-1/2” HEX BOLT (FULL THREAD) 501031 3/8 LOCK NUT 500254 FRONT CHANNEL 500255 CROSS CHANNEL 500256 REAR CHANNEL 500251 4’...
  • Page 9 4’x 4’ Kit Trailer Frame The edges of the trailer can be very sharp. To prevent injury, wear the provided safety gloves. Channel overlaps Figure 1. Front 500254 *FRAME IS UPSIDE DOWN - SQUARE HOLES FACING UP* Once Upside down USE 501049 on top & 501033 on the bottom 500255 Only hand-tighten hardware at this step Secure one side, before moving on to the next side...
  • Page 10 Step 3b- Frame Assembly - 4’x 6’ Kit Trailer Frame ITEM # PARTS DESCRIPTION 501049 3/8 X 3/4” HEX FLANGE BOLT 501033 3/8 X 1-1/2” HEX BOLT (FULL THREAD) 501031 3/8 FLANGE LOCK NUT 500254 FRONT CHANNEL 500255 CROSS CHANNEL 500256 REAR CHANNEL 500252...
  • Page 11 4’x 6’ Kit Trailer Frame The edges of the trailer can be very sharp. To prevent injury, wear the provided safety gloves. Channel overlaps Figure 1. Front 500254 500255 *FRAME IS UPSIDE DOWN - SQUARE HOLES FACING UP* Once Upside down USE 501049 on top & 501033 on the bottom Only hand-tighten hardware at this step Secure one side, before moving on to the next side 500255...
  • Page 12 Step 3c- Frame Assembly - 4’x 8’ Kit Trailer Frame ITEM # PARTS DESCRIPTION 501049 3/8 X 3/4” HEX FLANGE BOLT 501033 3/8 X 1-1/2” HEX BOLT (FULL THREAD) 501031 3/8 NYLON INSERT HEX FLANGE LOCK NUT 500254 FRONT CHANNEL 500255 CROSS CHANNEL 500256...
  • Page 13 4’x 8’ Kit Trailer Frame Channel overlaps The edges of the trailer can be sharp. To prevent injury, wear the provided safety gloves. Front 500254 Figure 1. 500255 Only hand-tighten hardware at this step Secure one side, before moving on to the next side Channel manufactured before November 2022 500255...
  • Page 14 Step 3d- Frame Assembly - 5’x 8’ Kit Trailer Frame ITEM # PARTS DESCRIPTION 501049 3/8 X 3/4” HEX FLANGE BOLT 501033 3/8 X 1-1/2” HEX BOLT (FULL THREAD) 501031 3/8 NYLON INSERT HEX FLANGE LOCK NUT 504599 FRONT CHANNEL 504602 CROSS CHANNEL 504600...
  • Page 15 5’x 8’ Kit Trailer Frame - The edges of the trailer can be sharp. Channel overlaps To prevent injury, wear the provided safety gloves. Front Figure 1. 504599 *FRAME IS UPSIDE DOWN - SQUARE HOLES FACING UP* Once Upside down USE 501049 on top & 501033 on the bottom Only hand-tighten hardware at this step Secure one side, before moving on to the next side 504602...
  • Page 16 STEP 4 – Axle Assembly ITEM # DESCRIPTION 500047 or 504617 4’ STRAIGHT AXLE or 5' STRAIGHT AXLE 500809 750 LB. SPRINGS 500814 3/8-16 U-BOLT 500259 LEAF SPRING MOUNTING BRACKET 500260 LEAF SPRING AXLE MOUNT PLATE 501031 3/8 NYLON INSERT HEX FLANGE LOCK NUT 501036 3/8 X 3/4”...
  • Page 17 STEP 4 – Axle Assembly Secure the leaf spring mounting brackets in the square holes on each side of the trailer with the carriage bolt 3/8 X 3/4” and 3/8 lock nut using 9/16 socket; the round holes of the brackets should be oriented closest to the center.
  • Page 18 48-048-KO8, 48-072-KO8, 48-096-KO8 (8” Wheel) 500258 8” FENDER 500841 4.80 X 8 LRC TIRE & WHEEL 504447 FENDER PLATE - 8” 48-072-KO12, 48-096-KO12,60-096-KO12 (12” Wheel) 504212 12” FENDER 500844 4.80 X 12 LRC TIRE & WHEEL 504476 FENDER PLATE - 12”...
  • Page 19: Step 6 - Tongue Assembly

    Step 6 - Tongue Assembly ITEM # DESCRIPTION 4 FT 5 FT 500257 TONGUE CHANNEL 504623 TONGUE CROSS CHANNEL 504162 5’ - TONGUE CONNECTION BRACKET 501049 3/8 X 3/4” HEX FLANGE BOLT 501033 3/8 X 1-1/2” HEX BOLT (FULL THREAD) 501031 3/8 NYLON INSERT HEX FLANGE LOCK NUT 501100...
  • Page 20 Step 7 - Tongue Connection Support Installation Put the tongue connection bracket with the threaded holes facing up place without sliding it fully into position. 2. Feed each wire of the wire harness between the tongue channel and separate your wire as follows.
  • Page 21 Step 8 – Hitch and Safety Chains ITEM # DESCRIPTION 504163 LONG COUPLER CHANNEL 504198 TONGUE SUPPORT FOOT - CHANNEL TONGUE 500805 1 7/8” COUPLER CLASS I 500804 SAFETY CHAIN - 3/16 X 4’ (CLASS I) 501031 3/8 NYLON INSERT LOCKING NUT 501023 3/8 X 2-1/2”...
  • Page 22 STEP 9 – Wiring & Lights ITEM # DESCRIPTION 4’ x 4’ 4’x6’ & 4'x8' & 5'x8' 500512 4 WAY FLAT 20’ WIRE HARNESS 503079 8” CABLE TIE 500558 WIRE CONNECTOR 500513 TAILLIGHT LEFT/DRIVER SIDE 500514 TAILLIGHT RIGHT/PASSENGER SIDE 500515 AMBER MARKER LIGHT 500516 PLASTIC LICENSE BRACKET...
  • Page 23: Wiring Diagram

    Wiring Diagram • Ground = White Wire • Tail/Running Lights/Marker Lights = Brown • Left Turn/Brake = Yellow • Right Turn/Brake = Green Ground white wire grommet to frame Amber Marker Light Amber Marker Light Passenger’s Taillight & Red Marker Light Driver’s Taillight &...
  • Page 24 Completed View 4' x 4' 4' x 6' Assembly instructions for kit trailers...
  • Page 25 Completed View 4' x 8' 5' x 8' Assembly instructions for kit trailers...
  • Page 26 Cut List - Wood Plank Cut List - Plywood (Wood not included) (Wood not included) 4’ x 4’ 4’ x 4’ 8pcs – 2x4 -18” (12ft -2x4 makes 8pcs) 8pcs – 2x4 –18” (12ft -2x4 makes 8pcs) 8pcs - 1x6 - 48” 4pcs –...
  • Page 27 4ft x 4ft Plywood Drill Template (Plywood not included) Drill 3/8" holes in plywood using the dimensions outlined below and use the full 3/8 X 1-1/2” thread hex bolts to secure to the frame. Holes for tie down kit optional (Tie downs not included) Assembly instructions for kit trailers...
  • Page 28 4ft x 6ft Plywood Drill Template (Plywood not included) Drill 3/8" holes in plywood using the dimensions outlined below and use the full 3/8 X 1-1/2” thread hex bolts to secure to the frame. Holes for tie down kit optional (Tie downs not included) Assembly instructions for kit trailers...
  • Page 29 4ft x 8ft Plywood Drill Template (Plywood not included ) Drill 3/8" holes in plywood using the dimensions outlined below and use the full 3/8 X 1-1/2” thread hex bolts to secure to the frame. Holes for tie down kit optional (Tie downs not included) Assembly instructions for kit trailers...
  • Page 30 5ft x 8ft Plywood Drill Template (Plywood not included ) Drill 3/8" holes in plywood using the dimensions outlined below and use the full 3/8 X 1-1/2” thread hex bolts to secure to the frame. Holes for tie down kit optional (Tie downs not included) Assembly instructions for kit trailers...
  • Page 31 Assembly instructions for kit trailers...
  • Page 32 Trailer Accessories Tongue Jack 12” Wheel & Fender Ramps Spare Tire U-Bolt Support Wheel Chock Tongue Extension www.westbrooktrailers.com...

This manual is also suitable for:

48-072-ko848-048-ko848-096-ko860-096-ko12