US Patent 7874571 Trailer with four wheel steering and independent suspension

A trailer having a frame extending along a longitudinal axis and having a front end and a rear end, a steering linkage coupled to the frame, a pair of front wheel assemblies coupled to the front end of the frame, and a pair of rear wheel assemblies coupled to the rear end of the frame. Each wheel assembly includes a wheel carrier having a pivot member pivotally coupled to the frame along a steering axis, the wheel carrier being coupled to the steering linkage so that actuation of the steering linkage pivots the wheel carrier about the steering axis, and a wheel rotatably coupled to the wheel carrier along a wheel axis. The wheel axis is oriented approximately perpendicular to the steering axis, and the wheel axis is offset from the steering axis.