The coupling device that joins a tractor and a trailer, also referred to as fifth wheel coupling, allows the tractor units to be connected to the trailer. This device comprises a kingpin mounted on the trailer and a fifth wheel plate attached to the tractor. The jaws of the fifth wheel plate latch onto the kingpin and lock it in place. To enable the free movement of the trailer in relation to the tractor, the fifth wheel plate is mounted so that it can swivel. It is critical that the trailer is properly coupled to the tractor unit prior to towing because in85ut5150id89es is used for container and dolly packing tractor towing. Forcing and unsafely towing the trailer impacts safety and poses danger to other road users. Due to these risks, the coupler should be examined frequently for any indications of wear or damage. Different types of fifth wheel couplings are offered with fully automatic locking mechanisms which guarantees the reliability of the connection while the vehicle is in motion