Abstract: A trailer suitable for hauling farm implements along highways is expandable from a contracted, empty position to an expanded loaded position. In expanded position, the rear support wheels are outside normal highway width limits. The trailer frame has a forward section, supported at its rear with centrally located ground wheels, and a pair of rear sections each supported by an outside wheel. Each rear section has a pair of transverse telescopic beams. One set of vertical hydraulic or pneumatic cylinders lifts the forward central wheels and the rear sections off the ground. A set of transverse cylinders moves the outside wheels to expanded position. Each outer rear beam section has a loading ramp hinged thereto about a transverse axle and a wheel support hinged thereto.