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For other uses, see Fifth wheel (disambiguation).
already coupled
The fifth wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. It consists of a nipple (also called a coupling pin or king pin) on the front of the semi-trailer and a horseshoe-shaped coupling device called fifth wheel on the rear of the towing vehicle. semi-trailer truck with sleeper behind the cab. ... The driver of this DAF tractor with an auto-transport semi-trailer truck prepares to offload Å koda Octavia cars in Cardiff, Wales A truck or lorry is a motor vehicle for transporting goods. ... see also Articulated vehicle Fifth wheel Tractor ... European type dolly trailer A dolly that can be hitched to a truck as a full trailer so as to support a semi-trailer. ... Suspension, showing tie rod, steering arm, king pin (axis) ball joints The kingpin is the main pivot in the steering mechanism of a car or other vehicle. ...
The biggest European manufacturer is a German company called Jost Automotive Germany.[citation needed]