Today, we're going to be taking a look at the Ultra-Fab Rota-Flex 5th Wheel Pin Box with Rubber Bushings by TrailAir, part number UF35-946202. This pin box will replace the standard Lippert 1621 pin box on your trailer. It has a shock-absorbing rubber bushings here at the plate as well as in the hinge of this pin box that is designed to help minimize trucking, giving you a smoother ride. As I… see more >