Abstract: A two wheeled trailer is provided with steerable wheels which are hydraulically actuatable according to the articulation angle between the trailer and a towing vehicle and to the forward and reverse mode of travel of these vehicles. In one embodiment, the angle to which the wheels are steered in response to the detected articulation angle may be less for forward travel than for reverse. Also, the wheels may be caused to assume a substantially straight ahead, non-steering configuration at forward speeds above a particular set point, with the steering automatically resumable upon lowering of the speed below another set point. Still another embodiment provides for steering of the wheels, whenever there is a transition between forward and reverse and an articulation angle exists, in a manner that prevents "crabbing" of the trailer relative to the towing vehicle.