Dodge Ram 2010 Owner's Manual page 441

4. Tongue weight rating for the trailer hitch utilized (This
requirement may limit the ability to always achieve the
10% to 15% range of tongue weight as a percentage of
total trailer weight).
Towing Requirements — Tires
• Do not attempt to tow a trailer while using a compact
spare tire.
• Proper tire inflation pressures are essential to the safe
and satisfactory operation of your vehicle. Refer to
"Tires–General Information" for proper tire inflation
procedures.
• Check the trailer tires for proper tire inflation pres-
sures before trailer usage.
• Check for signs of tire wear or visible tire damage
before towing a trailer. Refer to "Tires–General Infor-
mation" for the proper inspection procedure.
• When replacing tires, refer to "Tires–General Informa-
tion" for proper tire replacement procedures. Replac-
ing tires with a higher load carrying capacity will not
increase the vehicle's GVWR and GAWR limits.
Towing Requirements — Trailer Brakes
• Do not interconnect the hydraulic brake system or
vacuum system of your vehicle with that of the trailer.
This could cause inadequate braking and possible
personal injury.
• An electronically actuated trailer brake controller is
required when towing a trailer with electronically
actuated brakes. When towing a trailer equipped with
a hydraulic surge actuated brake system, an electronic
brake controller is not required.
• Trailer brakes are recommended for trailers over
1,000 lbs (454 kg) and required for trailers in excess of
2,000 lbs (907 kg).
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