Fits universal 4-bolt rail kit (P/N 30095) Must utilize center attachment points for 20K capacities included with 20K Fifth Wheel Hitches) or 10-bolt rail kit (P/N 30035). Covers all 20K user requirements, including light commercial Full floating head for improved hooking and unhooking, as well as ride Double jaw system completely surrounds the king pin for significantly reduced wear Lubricated and clamped side joints for tight and efficient operation Lightweight, easy to install and remove Adjustable height, from 13" to 17" Sturdy, robust and reliable One-piece formed legs, provides a wider footprint for superior stability Sidewinder compatible, preferred for short bed pickups Compatible slider system available Best value in marketplace, more combination options Available with your choice of either #30035 or #30095 base rail kits