The Joskin Drakkar multi-purpose trailers can be fitted with an unloading auger to unload grains into a road transport trailer at the edge of fields, to fill a seeder or to unload industrial fertilizers. The system includes a moving floor to a first horizontal auger, which is placed on the whole width of the door and is driven by a hydraulic pump. This horizontal auger brings the matter out of the trailer. It is driven by a hydraulic pump. The transfer auger has a diameter of 500 millimeters. A control box is also delivered in order to control the system from the tractor cabin. This compact auger can be hydraulically folded and transported. A second door is also delivered in order to use the Drakkar multi-purpose trailer without the auger.