An example apparatus is configured to couple to a trailer and a tow vehicle. The apparatus includes a frame; one or more clamps mounted to the frame and configured to couple the frame to an underplate of the trailer; and a shaft having a first end rotatably coupled to the frame and a second end configured to couple to at least one replicated element of a towed vehicle. The at least one replicated element is configured to engage the tow vehicle.

An underlift fork-air suspension coupling unit for towing a semi-trailer truck having an air-ride suspension is provided. The coupling unit includes a substantially cylindrical device including a first end configured to engage with the air suspension slot beneath the air springs of certain air-ride suspensions of semi-trailer trucks, a second end configured to engage with a receiver of an underlift towing device, and a collar coaxially disposed between the first and second ends for separating the first and second ends. The coupling unit replaces underlift forks that are conventionally used with underlift towing devices. By specifically engaging with the air suspensions slot of these air-ride suspensions, rather than the axle as with the underlift forks, the coupling unit avoids the potential for the underlift device to bottom out against the underbody of the semi-trailer truck to be towed.

A truck towing system is described. The truck towing system provides for a first truck to tow a second truck in a back to front relationship, i.e., the front portion of the second truck (the towed truck) is connected or attached to a rear portion of the first truck (the towing truck). The truck towing system includes an upper member to connect with a first truck. A middle member joins the upper member and a lower member in a fixed engagement. The lower member supports a front portion of a second truck. A beam member is engaged to the lower member, and the beam member extends and retracts from an interior of the lower member. The beam member connects to a rear portion of the second truck.

A rocker body assembly includes a rocker body having a top surface with a hook formed thereon and a bore having an oval cross-section formed through the rocker body. The bore includes a crescent-shaped surface adjacent the hook and a primary surface formed on the top surface. A channel formed in the primary surface extends into the oval cross-section of the bore. A J-bolt having a threaded end and a hook end may be slidably disposed through the bore and channel, with a washer and threaded fastener engaging the threaded end to generate a clamping force securing an axle between the hook of the rocker body and the hook end of the J-bolt. The crescent-shaped surface enables rotational alignment of the J-bolt within the bore to accommodate axles of various sizes and is configured to reduce bending stresses and torque applied to the washer, the J-bolt, and the threaded fastener.