An improved articulated heavy haul trailer combination comprises a trailing accessory vehicle such as a booster coupled to a main trailer by a coupling. The coupling includes a horizontal hinge, a vertical hinge that allows the trailing accessory vehicle to yaw in a horizontal plane, a spreader extending between the hinges and a hydraulic piston and cylinder. A turn sensor mounted on said combination detects yawing, and a controller reduces the piston and cylinder's downward biasing force on the coupling.

The present invention relates in general to a fifth wheel hitch and method of using a fifth wheel hitch that is mounted to a bed of a towing vehicle, and more specifically, to a fifth wheel hitch that is vertically secured to a kingpin of a fifth wheel trailer without requiring the use of adapters or extensions. One aspect of the fifth wheel hitch and method of use includes a hitch head assembly that is adjustable in height such that the fifth wheel hitch is compatible with different sizes of towing vehicles and fifth wheel trailers. The hitch head assembly also incorporates a funnel shaped design for receiving the kingpin of the fifth wheel trailer in a vertical fashion to prevent the kingpin from sliding horizontally out of the hitch head after being pulled forward by the towing vehicle. A four-way pivot joint accommodates instantaneous variations in pitch and/or roll attitudes between the towing vehicle and the fifth wheel trailer connected by the fifth wheel hitch. The hitch head assembly further includes a latching and locking mechanism that indicates whether or not a secure connection has been properly executed between the fifth wheel hitch and fifth wheel trailer to assure an operator that the towing vehicle is ready for travel.

A trailer to vehicle laterally stable hitching mechanism wherein an attaching plate of the trailer vertically and laterally self-aligns into a receiving plate of the vehicle establishing the trailer as an operational extension of the vehicle.

A pin box is provided having a removable and removable hitch. The removable hitch has a kingpin end and a ball end. The pin box has a skid plate with an aperture with a receiver that can receive and affix the removable hitch. The skid plate is reinforced to the receiver to carry the load when the ball end of the removable hitch is being used. A pin is slidable between a locked position where the removable hitch is retained and an unlocked position where the removable hitch is removable. The pin extends through an aperture in the removable hitch to affix the removable hitch to the pin box.

A pin box is provided having a removable and removable hitch. The removable hitch has a kingpin end and a ball end. The pin box has a skid plate with an aperture with a receiver that can receive and affix the removable hitch. The skid plate is reinforced to the receiver to carry the load when the ball end of the removable hitch is being used. A pin is slidable between a locked position where the removable hitch is retained and an unlocked position where the removable hitch is removable. The pin extends through an aperture in the removable hitch to affix the removable hitch to the pin box.

A hitch adapter device for a vehicle tow ball comprises a fastening device adapted to fixedly arrange the hitch adapter device to the vehicle tow ball in a releasable manner. The hitch adapter device further comprises a receiving tube adapted to receive an object to be hitched to a vehicle comprising the vehicle tow ball.

The present invention provides a trailer arm component in the technical field for vehicle traction device, which improves poor stability of the existing trailer arms. The trailer arm component or the invention comprises a connection arm; a support arm which is connected with the connection arm and has a mounting hole; a primary ball head having an extension part which has a cylindrical shape and is inserted into the mounting hole; and a secondary ball head having a mounting part which is inserted into the extension part and threaded with the extension part. The present invention provides the advantages including a simple structure, firm connection and better stability.

A ball mount apparatus, for hitching a trailer to a vehicle, which can include up to three or more hitch balls of different size connected to a ball block which can be locked, unlocked, and rotated manually, without the use of tools, for positioning a selected ball for use. The ball block can also be rotated by hand between a rearwardly extending towing position and a forwardly extending stowed position.

A hitch/step system which includes a main body that acts as a step when installed in a horizontal position and a vertically adjustable hitch when installed in a vertical position. In addition to a hitch attachments are provided for use with the hitch including a ball mount, a pindle lock and a shackle. The hitch attachments are interchangeable and seperably coupled to the main body and may be removed when not towing and when using as a step. Additional components include interior reflectors and removable LED lights.

A trailer includes a trailer bed, a draw bar assembly, and a convertible hitch assembly. The trailer bed includes a platform and one or more sets of two or more wheels. The draw bar assembly is coupled to the trailer bed. The convertible hitch assembly includes a hitch converter coupled to the draw bar assembly. The convertible hitch assembly includes an over-axle hitch coupler insertable into the hitch converter, wherein the over-axle hitch coupler is mated to an over-axle hitch component coupled to a first vehicle. The convertible hitch assembly includes a behind-axle hitch coupler insertable into the hitch converter, wherein the behind-axle hitch coupler is mated to a behind-axle hitch component coupled to at least one of the first vehicle or an additional vehicle.