its extended position the trailer 10 is moved to its lowered position shown in fig6 when the hydraulic cylinder pulls or retracts the trailer is raised into the position shown in fig5 a benefit of not relying on gravity to rotate the axles 20 22 of the present invention is that the center of the wheels 34 can be located forward of the pivot pin 26 and the trailer will still function in the prior art wheels had to be placed substantially behind the pivotal location on the trailer to generate the moment needed to turn the axles a single axle version of the suspension 12 u2032 is shown in fig7 11 this version of the suspension 12 u2032 functions in much the same way as the two axle version the main difference being the lack of a second axle in the single axle version the connecting plates 60 are welded in a central location on the axle 62 to receive the end 42 of a single hydraulic cylinder 38 the axle 62 pivots about pivot pins 64 on the trailer 10 u2032 the pins extend through outer plates 66 near the ends of the axle 62 when the hydraulic cylinder 38 is extended the trailer 10 u2032 will be in its lowered position shown in fig8 and 11 when the hydraulic cylinder is in its retracted position the trailer 10 u2032 will be in its raised.