Abstract: When, according to the invention, a drive unit for trailers or caravans is arranged such that it comprises a chassis (2) with crawler sections (3), a coupling device (4) having first and second coupling parts (28, 29), said coupling parts (29) being arranged on the hitch triangle (30) behind the normal hitch coupling and behind the nose wheel, and the drive unit additionally comprises means for steering and maneuvering the unit, a good weight distribution is achieved between main wheel and drive unit, so that it is easy to control the placing of the trailer or of the caravan, without having to worry about the risk of colliding with the neighbour or damaging one's own vehicle.