The Trailer Couplingbelongs to the technology area of moving conveyor devices. Such device includesa flatbed truck that carries the products. The axle of the described flatbedtruck equipped with the worm with meshing with the gear of the worm. Such gearof worm support in the flatbed truck and connects with the input of the motorthrough the coupling. The described motor is placed in the tractor. In this way,when you start the motor, its output will drive the worm gear to whirl throughthe coupling, so as to drive the worm to whirl, as a result, to drive the wheelsof the flatbed of the same axle, so the flatbed truck connect with the tractiontruck to move in the desired direction. Since there is no need to use the humandrivers, significantly reducing the labor intensity, while avoiding burns andother accidental injury.