Class III/IV hitches used as Weight Carrying are rated up to 6,000 lbs. Gross Trailer Weight (GTW) with a maximum trailer Tongue Weight (TW) of 600 lbs. The use of a ball mount and hitch ball of the same rating or higher is required. To use the weight distribution side of the hitch, a weight distribution system is required. Class III/IV hitches attach to the vehicle frame only. Always consult your owner's manual for vehicle rating.