Abstract: A transfer trailer includes a floor, a top covering, and at least a pair of walls. At least one of the pair of walls and the top covering are movable relative to the floor between closed and opened positions. In the opened positions, the trailer provides an opening for directly receiving the articles from the loading apparatus. The trailer includes also a controller for controlling the movement of the movable wall and the top covering. The top covering is hingedly attached to the movable wall and the other of the pair of walls along corresponding imaginary lines of attachment defining corresponding axes. The movable wall is rotatable about the axis defined by the imaginary line attaching the movable wall and the top covering, and the top covering is rotatable about the axis defined by the imaginary line attaching the top covering and the other of the pair of walls.