No mounting rails means it's removable and you can use your truck for more than towing. Fully articulating head allows front to back and side to side pivoting. Three vertical adjustments from 17" to 19." 2" of front to back adjustment with two coupler positions. Cam action latching handle for easy release, even when parked on unlevel sites. 1" thick, wrap-around jaws fit kingpin perfectly, eliminating sloppy starts and stops. Polyurethane bushings provide a quiet, rattle free towing experience. Fits 4 pucks in truck bed. Release handles and it easily converts to a level bed.