a. a fifth wheel having a plurality of journal bearings extending generally downward from an underside thereof; and

b. a generally planar transverse beam member for mounting said assembly to a truck frame, said beam member dimensioned to span across longitudinal truck frame members and having walls extending generally outward from the forward and rearward periphery thereof and mounting flanges extending generally downward from either lateral periphery thereof, said mounting flanges including a plurality of apertures for receiving fasteners inserted therein for mounting said beam member to the truck frame members, and a plurality of pivot bearing pairs to receive said journal bearings coupled thereto by a trunnion, said pivot bearing pairs extending generally upward from said beam member.