A steerable carriage for moving a wheeled object comprising at least one engagement device (3) configured to engage with and elevate a wheel (5) of the wheeled object off the ground such that the wheeled object can be moved upon displacement of the carriage by transmitting a propulsion force from the carriage to the wheeled object via the at least one engagement device, wherein the at least one engagement device comprises: a support device (12), an actuating device (13) movable with respect to the support device such as to cause the wheel to roll forward onto the support device and be held by the support device and the actuating device, wherein the support device comprises: a stopping member (18) movable between a folded position and a stopping position in which it is configured to stop forward motion of the wheel, and an activation member (23) configured to cause the stopping member to move from the folded position to the stopping position when the wheel is rolled onto the support device.

A retrofit trailer board system for vehicles is disclosed, including a trailer board carrying a plurality of signalling lights on a surface thereof, and a relaying control unit which is connected between the trailer board and a plurality of optical sensors. Each optical sensor is arranged for removable connection to the exterior surface of respective vehicle lights, each sensor being configured to issue a signal responsive to operation of a vehicle light.

Certain exemplary embodiments can provide a tow bar. The tow bar is constructed to be coupled to a towing vehicle and a slingshot motorcycle. The tow bar defines a rectangular aperture. A length of the rectangular aperture is smaller than a diameter of a central tire of the slingshot motorcycle. The tow bar can be fixedly coupled to a pair of chains. Each of the pair of chains is coupleable to a bumper of the towing vehicle.

A method for slowing transfer of a heavy work machine on a sloping base using a separate transportation device equipped with wheels, the work machine including a set of booms having at least one operating cylinder, an auxiliary device, and a brake including a brake surface, the method including the steps of towing the work machine using a transfer vehicle and the transportation device, supporting the work machine at least partly on top of the transportation device such that the crawler chassis is raised off the sloping base, and supporting the auxiliary device on the brake, the brake surface of the brake contacting the sloping base, using the operating cylinder to press the brake surface against the sloping base to create friction to slow transfer speed of the transportation device, and adjusting pressing of the brake surface taking place through the auxiliary device using the operating cylinder.

A retrofit trailer board system for vehicles is disclosed, including a trailer board carrying a plurality of signalling lights on a surface thereof, and a relaying control unit which is connected between the trailer board and a plurality of optical sensors. Each optical sensor is arranged for removable connection to the exterior surface of respective vehicle lights, each sensor being configured to issue a signal responsive to operation of a vehicle light.

A hub and suspension assembly for tow dolly and car hauler trailer with drop-down capability comprises: a suspension tower, a screw, a chuck, a lug member, an upper threaded block, a spring, a lower non-threaded block, an axle, and a hub. The tow dolly comprises: a plurality of frame members, a first and a second hub and suspension assembly for tow dolly and car hauler trailer with drop-down capability, and a first and a second wheel and tire assembly. Car hauler trailer comprises: a plurality of frame members; a first, second, third, and fourth hub and suspension assembly for a tow dolly and a car hauler trailer with drop-down capability; and a first, second, third, and fourth wheel and tire assembly.

Hub and suspension assembly for tow dolly and car hauler trailer with drop-down capability comprises: a suspension tower, a screw, a chuck, a lug member, an upper threaded block, a spring, a lower non-threaded block, an axle, and a hub. Tow dolly comprises: a plurality of frame members, a first and second hub and suspension assembly for tow dolly and car hauler trailer with drop-down capability, and a first and second wheel and tire assembly. Car hauler trailer comprises: a plurality of frame members; a first, second, third, and fourth hub and suspension assembly for tow dolly and car hauler trailer with drop-down capability; and a first, second, third, and fourth wheel and tire assembly.

A frame of a vehicle dolly includes a wheel cradle opening to receive a wheel of a vehicle to be towed. A hinged member is pivotally attached to the frame and is movable between an open position and a closed position to form part of a wheel cradle. A hinge activation device contacts the wheel within the wheel cradle opening and responsively moves the hinged member toward the closed position. The frame of the vehicle dolly is vertically slidably coupled to an axle assembly such that the frame can be raised and lowered. An extension member may extend from the frame and receive a tow truck stinger member, wherein the frame can be raised or lowered under motive force of the stinger member.

Certain exemplary embodiments can provide a tow bar. The tow bar is constructed to be coupled to a towing vehicle and a slingshot motorcycle. The tow bar defines a rectangular aperture. A length of the rectangular aperture is smaller than a diameter of a central tire of the slingshot motorcycle. The tow bar can be fixedly coupled to a pair of chains. Each of the pair of chains is coupleable to a bumper of the towing vehicle.

A tow dolly cross rail assembly includes a male bar and a pair of female bars arranged in a slidable relationship, forming an arched configuration that creates a positive camber effect at dolly tires at the outer ends of the bars. The male bar comprises an apex that forms an angle that orients upwardly, forming an angle between about 165 to 179. The center male bar and pair of female bars are arranged in a slidable relationship with each other. The midpoint of the center male bar forms an apex. The inner end of female bars is in a slidable relationship with free ends of center male bar. The female bars telescopically slide along the free ends of center male bar for increasing and decreasing length of cross rail. The arched configuration of the center male bar slopes the female bars to create a positive camber at the dolly tires.