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A system for vertically lifting and lowering a container relative to a supporting surface. The system includes at least two lift mechanisms wherein each mechanism includes a frame attached to the container. An elongated cylinder and piston is associated with each frame so that its axis is substantially vertical. A control circuit selectively connects a power source to each cylinder and piston to move the cylinder and piston between a retracted position in which the piston is spaced upwardly from the supporting surface and an extended position in which a foot on the piston engages the supporting surface and lifts the container upwardly from the supporting surface.