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When an especially bulky trailer or heavy load requires more towing power class 4 steps in to take the reins. CURT class 4 trailer hitches are made with all-American steel and a powerful design. They are commonly found on commercial vans and larger pickup trucks and SUVs. Class 4 boasts a gross trailer weight capacity of up to 10000 lbs. and a tongue weight capacity at 1000 lbs. Also like many class 3 hitches this class 4 hitch can be used in combination with a weight distribution hitch to increase its overall towing capacity. With a weight distribution system attached the gross trailer weight capacity increases up to 12000 lbs. and the tongue weight capacity up to 1200 lbs. NOTE: Never exceed the lowest weight capacity of any towing component.