The CURT weight distribution hitch is a specialized towing system that provides improved vehicle and trailer control by leveling the trailer and more evenly distributing its tongue weight across the trailer's and vehicle's axles.2" x 2" shank is compatible with Class III, IV and most Class V trailer hitches, including Xtra Duty and Commercial Duty (2 1/2" replacement WD shank may be required), as well as some RV trailer hitches. While a weight distribution hitch will increase the gross trailer weight capacity of most trailer hitches, the vehicle's weight carrying capacity must be taken into consideration before towing a heavier trailer (NOTE: Never exceed the lowest weight capacity of any towing component).This round bar weight distribution hitch features a heavy-duty formed head and round spring bars constructed from forged steel. It offers a gross trailer weight capacity up to 10, 000 lbs. and a tongue weight capacity of 1000 lbs. It also includes hook-up brackets, spring bar safety chains and a pin and clip. A trailer ball must be purchased separately. 12"" adjustable shank fits 2"" x 2"" receiver tube openings 2 1/2"" x 2 1/2"" WD replacement shank also available Snap-up brackets & lift handle allow for easy leveraging of spring bars | Curt Round Bar Weight Distribution Kit, 1000 lb