What is a trailer "Kingpin"?

The bed plate (or rubbing plate) is a heavy duty horizontal plate on the underside of the front of the trailer which is designed to sit and slide on top of the tractor fifth wheel. It houses the kingpin.

A fifth wheel is the horizontal coupling plate on a tractor unit which slides underneath the trailer bed plate during coupling. It has jaws which clamp onto the kingpin.

Smart Kingpin: Continuous monitoring, alerts potential issues, ensures safety, UNECE Approval. Ideal for new builds or retrofitting.