Abstract: A vertically elongated frame is provided including pairs of opposite sides and each opposite side includes a pair of upstanding opposite side guides. First, second and third pairs of upper, intermediate and lower hydraulic cylinders are provided on each frame side and the lower portion of each upper cylinder lower portion is communicated with the upper portion of the next lower cylinder upper portion whereby fluid pressure in all of the cylinders is maintained equal and the cylinders may extend in sequence with the upper cylinders extending first, the intermediate cylinders extending second and the lower cylinders extending last. Further, the equalization of the fluid pressures within the cylinders also enables the cylinders to retract in sequence with the lower cylinders retracting first, the intermediate cylinders retracting second and the upper cylinders retracting third.