A toy trailer for towing or hauling transportable elements including a unique tow hitch assembly and suitable for use with remotely-controllable motorized toy vehicles having a highly-maneuverable skid steering systems driven by single or dual motors, having a separately motorized loading device...http://www.google.de/patents/US5846120?utm_source=gb-gplus-sharePatent US5846120 - Toy tow trailer with self-leveling hitch assembly
