Curt Manufacturing 17422 Towing Wiring Levels tow vehicle and trailer by distributing a portion of the tongue weight Includes a sway control kit #17200 to help reduce trailer sway Equipped with 28 3/8" trunnion-style, forged steel spring bars,Adjustable shank fits 2" x 2" receiver tube openings Heavy-duty, formed head can be adjusted for precise leveling Sway control easily mounts on built-in sway control attachment tabs