Volvo has announced that fifth wheels from Jost International will be supplied as standard equipment on all VN and VHD tractors. Mack made a similar announcement previously, saying that Jost coupling devices are now a standard feature on all Pinnacle, Titan and Granite models. They had been options before.
The Jost fifth wheel model uses a spring-loaded locking bar that automatically secures the kingpin once it slides into position. Equal support on each side of the coupling helps distribute the trailer load evenly, said to result in reduced wear.
The Jost fifth wheel needs only 60 lb of pulling force to disconnect, so drivers should be pleased.