It's possible that this was a popular setup; I wouldn't know since it would have been before my time. At any rate, I wonder how long that tiny air cooled engine would last under this kind of load. (video is from the 70s). Neat seeing the driver being able to turn the car 360 degrees--under the trailer--while the latter stays stationary.
1974 Volkswagen Beetle & Camper - road test - YouTube