"Dave’s Super Service, appears to have used this Harley-Davidson to pickup customers cars at their home or work location, which was a common thing to do at the time. The operator then attached a clamp-on hitch to the cars rear bumper and used it to tow the bike back to the shop with to the device you can see in front of the tire. The routine was then reversed to take the car back. This also freed up the rig to bring in or deliver more cars and it could also be used for picking up parts and supplies. A busy shop would keep the operator with one of these on the go all day"

      Via: The Old Motor