In order to fully fill the lorry, and hence minimise transport costs, the conveyor can rotate, filling the skip from front to back. It can also elevate/depress. This latter is used both to expedite filling, and also to make it easier to clean/maintain.
The side-to-side rotation is accomplished with electricly-driven ground wheels, and the elevation/depression with hydraulic cylinders actuated by a hydraulic compressor/power-pack.