A kingpin secures the fifth wheel to the trailer, and it allows the front axles of the truck or tractor to move freely on their own. ... Fifth wheel RV’s also pose less of a threat for claims since ...

How often do you see a fifth wheel in full-camp mode outside of a well-developed RV park ... due to the fact that the unit hangs down quite a bit lower than the trailer's original kingpin, ...

SmithCo Inc. has developed a patent-pending kingpin housing for its side-dump trailers that’s intended to improve durability and reduce maintenance costs. Kingpins, which connect trailers to a ...