Parkit360° Trailer Dolly | Mover for Boats + RV Trailers, Parkit360° Power Trailer Dolly Models are compact, battery powered movers that are perfect for parking RV Trailers, Boat Trailers, Camping Trailers and more. Compatible with many Ball Mounted Hitches, our Dollies pull and park with ease, performing well on varied terrains. Discover Simple parking for every trailer.