B&W RVB3405 Slider Companion Base, Pair with RVC3006 Companion coupler

Pairs with RVC3006 (the Companion coupler) to have a complete fifth wheel hitch.
Jaws are machined to precisely fit your coupler, so there isn't room for sloppiness. A shock absorber allows side-to-side movement without slamming. And the whole coupler rides on polyurethane bushings that absorb roughness from the road.