Patent ID: 7153080

Claim:
A trailer having a capability to alter a height of a deck relative to a frame, said trailer comprising: (a) the deck; (b) a plurality of rollers operatively, rotatably affixed to the deck; (c) the frame; (d) a plurality of the ground engaging wheels operatively, rotatably affixed to the frame; (e) a plurality of diagonal C-channels operatively rigidly affixed to the frame and into which the rollers engage, each of said plurality of diagonal C-channels arranged at a diagonal relative to a vertical line, and lying in a vertical plane that lies parallel to a forward direction; (f) a stop in the C-channels at which the rollers rest at a transport position; (g) an upper leg in the C-channels above the stop through which the rollers travel to a position higher than the transport position; (h) a lower leg in the C-channels below the stop through which the rollers travel to a position lower than the transport position; and (i) at least one actuator having two ends, a first end being operatively attached to the frame, a second end being operatively attached to the deck, said actuator being arranged to apply forces forward and backward on the deck to encourage the plurality of rollers to travel in the rollers' respective diagonal C-channels, thereby changing a vertical position of the deck relative to the frame.