Abstract: A fifth wheel for use between a tractor and a trailer wherein the trailer has a king pin comprising a frame mounted on the tractor, a lower plate member, an intermediate plate member formed of a low friction material and mounted on the lower plate member, an upper plate member covering the low friction layer, a coupling support mounted on the upper plate member and a king pin retention device mounted on the coupling support.

Abstract: A fifth wheel for use between a tractor and a trailer wherein the trailer has a king pin comprising a frame mounted on the tractor, a lower plate member, an intermediate plate member formed of a low friction material and mounted on the lower plate member, an upper plate member covering the low friction layer, a coupling support mounted on the upper plate member and a king pin retention device mounted on the coupling support.

Abstract: A fifth wheel assembly for coupling a tractor to a trailer wherein the assembly includes a housing and a fixed plate which is secured to the trailer unit, and a king pin assembly having a body portion rotatably mounted within the housing, a plate member rotatably mounted with respect to the fixed plate, the king pin being secured to said body portion and plate member and being rotatable therewith. The ability of the king pin to rotate within the housing minimizes friction and reduces maintenance.