A load-bearing trailer dolly which connects a tongue-type boat, utility or other trailer to a towing tandem trailer and bears weight from the trailer during towing. In a preferred embodiment, the trailer dolly is characterized by an axle mounted on a pair of wheels. A dolly frame height-adjustable trailer hitch centered coaxial above the axle axis and midway point framed dolly plate mount by operation of an adjustable sleeve reducer fastened by pinning and lock. Includes dual connecting adjustable height tongues for attachment to rear end trailer hitches on the tandem towing trailer at which a pair of hitch fasteners for engaging the trailer dolly tongues are attached to the rear of the tandem trailer. The adjustable tongue hitches on trailer dolly will give ability to horizontal level tandem dolly. A shock-absorbing spring is fitted between the axle mount and the dolly frame for cushioning the dolly frame on the axle mount as the trailer is towed behind the towing tandem trailer. In the industry of dollies, the car dolly has no shock-absorbing function, just square axle with hubs for wheels, axle is attached to car dolly frame. There is an option with shock-absorbing mechanism or s non shock-absorbing option.

The vehicle system can include: a set of vehicle couplings (e.g., a tractor interface, a trailer interface, etc.); a chassis, a battery pack, an electric powertrain, a sensor suite, and a controller. The modular vehicle system can optionally include landing gear, a suspension, and any other suitable set of components. The vehicle system functions to structurally support and/or tow a trailer—such as a Class 8 semi-trailer—and/or to augment/supplement a tractor propulsive capability (e.g., via a diesel/combustion engine) with a supplementary electric drive axle(s).

A trailer stand positionable by a shunt truck is disclosed. The trailer stand includes a leg assembly having a front pair of legs and a back pair of legs, the front pair of legs connected by a front cross support and the back pair of legs connected by a back cross support, a wheel assembly having a wheel assembly frame that has a first end and a second end, the first end connected to the back pair of legs, the second end retaining an axle, the axle rotatably retaining at least two wheels, a stepped assembly having a front end, a back end, a top, and a bottom, the front end connected to the front cross support, the back end connected to the back cross support, the top of the stepped assembly providing a plurality of landing areas for an end of the semi-trailer, and a lifting frame.

A robotized tractor unit comprises a frame and a housing, an axle mounted on the frame, at least two main wheels mounted on either side of the axle, at least one electric engine arranged to drive the wheels to rotate through transmission, a braking system, a fifth wheel, a mechanism for damping and adjusting the position of the fifth wheel, a control system, wherein the mechanism for damping and adjusting the position of the fifth wheel comprises a first and a second support elements and a first and a second independently controlled pneumatic units.

The design of the present invention provides for the reliable damping of the fifth wheel, the simplifying of its coupling to a semi-trailer, allowing for towing the semi-trailer at any design height, as well as ruling out a forward or rearward semi-trailer displacement force during lifting the fifth wheel, when the tractor unit is braked.

A portable trailer stabilizer, comprising: (i) a support surface engagement element configured to selectively engage a support surface; (ii) a trailer engagement element configured to selectively engage a forward end portion of a trailer; (iii) a hydraulic cylinder operatively connected between the support surface engagement element and the trailer engagement element, the hydraulic cylinder configured to extend the trailer engagement element relative to the support surface engagement element; (iv) an on-board, self-contained energy source comprising a hydraulic accumulator operatively coupled to the hydraulic cylinder; (v) an isolation valve fluidically interposing the hydraulic cylinder and the hydraulic accumulator; (vi) a positioning element engagement element configured to selectively couple with a trailer stabilizer positioning element of a tractor; and (vii) a valve operator mechanism configured to (a) open the isolation valve when the when the positioning element engagement element is coupled to the trailer stabilizer positioning element of the tractor, and (b) shut the isolation valve when the positioning element engagement element is uncoupled from the trailer stabilizer positioning element of the tractor, where the hydraulic cylinder, the hydraulic accumulator, and the isolation valve are operatively connected in a closed hydraulic system containing a hydraulic fluid.

A drawbar arrangement for a dolly vehicle, the drawbar arrangement comprising a control unit and an adjustable drawbar attached to the dolly vehicle, the adjustable drawbar comprising a front coupling element arranged to be adjusted vertically with respect to a ground plane by the control unit, wherein the control unit is arranged to determine a vertical coupling load associated with the front coupling element, and wherein the control unit is arranged to set a desired vertical coupling load associated with the front coupling element by vertically adjusting the front coupling element when coupled to a towing vehicle unit.

Systems are provided for assisting in towing a trailer by a lead vehicle. A wheeled tow assist unit couples between the lead vehicle and the trailer. A drive unit onboard the tow assist unit drives the wheels in response to a force between the trailer and the tow assist unit. The tow assist unit bears at least a portion of the force required to tow the trailer.

A dolly vehicle includes at least one motion support device, MSD, and a control unit arranged for vehicle motion management, VMM, wherein the control unit is configurable in a master mode where the at least one MSD is controlled based on a set of capabilities of a vehicle combination comprising the dolly vehicle to fulfil an assigned task. The control unit is configurable in a slave mode where the at least one MSD is controlled based on requests received from an external master control unit.

A trailer stand positionable by a shunt truck is disclosed. The trailer stand includes a leg assembly having a front pair of legs and a back pair of legs, the front pair of legs connected by a front cross support and the back pair of legs connected by a back cross support, a wheel assembly having a wheel assembly frame that has a first end and a second end, the first end connected to the back pair of legs, the second end retaining an axle, the axle rotatably retaining at least two wheels, a stepped assembly having a front end, a back end, a top, and a bottom, the front end connected to the front cross support, the back end connected to the back cross support, the top of the stepped assembly providing a plurality of landing areas for an end of the semi-trailer, and a lifting frame.

The present disclosure is directed to a trailer stand for a semi-trailer comprising a frame having a front end, a back end, the front end having a pair of front legs and the back end having a pair of back legs; a wheel assembly having a wheel assembly frame, the wheel assembly frame comprising at least two wheels; a pair of stepped assemblies, each of the pair of stepped assemblies connected to the top of one of the pair of front legs and one of the pair of back legs, the pair of stepped assemblies providing a plurality of landing areas for an underside of the semi-trailer; and a lifting system connected to the wheel assembly and to the frame, the lifting system configured to raise and lower the frame relative to the wheel assembly.