2004 Dodge Ram 3500 Pickup Owner Manual Diesel - Page 278

278 STARTING AND OPERATING Trailer Weight and Trailer Tongue Weight Gross Trailer Weight (GTW) means the weight of the trailer plus the weight of all cargo, consumables and equipment loaded on the trailer when in actual underway towing condition. The recommended way to measure GTW is to put your fully loaded trailer on a vehicle scale. The entire weight of the trailer must be supported by the scale. Tongue Weight is the weight placed on the vehicle's trailer hitch by the trailer. Always load a trailer with 60% to 65% of the weight located ahead of the trailer axle(s) sufficiently to place 10% to 15% of the GTW on the tow hitch of your vehicle. Equalizing hitch are required for Class III or IV trailer hitches and tongue weights above 350 lbs (159 kg) and use of trailer sway control is recommended. Tongue weight must be equal to at least 10% of GTW, but no more than 15% of GTW. Also, there are maximum tongue weight ratings that are not to be exceeded, as follows: • Class III (the bumper ball type) 500 lbs (227 kg) • Class IV (the receiver hitch type) 1200 lbs (544 kg)