Abstract: A steering stabilizer and quick coupling assembly for a multi-trailer combination or train consists of a tractor, a towing or lead trailer, a steerable dolly and a rear or towed trailer. The assembly minimizes the oscillatory yaw and rollover tendency between the towed trailer and its steerable dolly. It also provides for quick coupling or uncoupling between the lead or towing trailer and the towed trailer. Further, it prevents off-tracking steering misalignment between the lead trailer and the steerable dolly. The assembly is mounted between the lead and rear trailers, and has as its basic components, a drawbar member and coupler assembly which are pivotally coupled and uncoupled at a vertical pivot on the drawbar member. The drawbar member and coupler assembly are each pivotally connected to a respective trailer frame portion for movement only about a transverse horizontal axis, and the vertical pivot is preferably located substantially midway between the transverse horizontal pivot axes.

Abstract: A disk brake system is provided for a tractor and trailer combination in order to control articulation between the tractor and trailer. The hydraulically operated disk brake and disk brake housing are operatively secured to the fifth wheel coupling provided on the tractor and are positioned by a disk brake housing receiving structure located on the trailer when the trailer is attached to the tractor. The fifth wheel coupling has a concentric attachment secured thereto on the side opposite the kingpin receiving socket provided therein. The disk brake has an annular disk brake concentric surface which is pivotally attached at its ends to brackets provided on the fifth wheel and which is slidably engaged by the concentric attachment when the tractor and trailer are attached. The disk brake includes pads located on opposite sides of the disk brake concentric surface.

Abstract: A steering stabilizer is provided for a conventional multi-trailer combination or train consisting of the usual powered vehicle or pulling tractor constituting the No. 1 element of the train; a lead or first trailer constituting the No. 2 element of the train; a wheeled and rotatable vehicle or dolly constituting the No. 3 element of the train and a rear or second trailer constituting the No. 4 element of the train. A conventional drawbar has one end pivotally connected to the forward end of the frame of the No. 3 element and has the other end pivotally connected to the trailing end of the frame of the lead trailer or No. 2 element.