Abstract: A dolly to facilitate the manual moving and positioning of trailers and other vehicles incorporating ratchet mechanisms to provide a high mechanical advantage for moving the vehicles. The ratchet mechanism can be selected to drive in the forward or reverse direction through a ground engaging wheel. A drive disc is mounted for rotation with the ground engaging wheel and is engaged by pawls from drive and holding ratchet mechanisms. The holding ratchet mechanism is mounted on the frame of the device and the drive ratchet mechanism is mounted on a yoke carrying an actuating handle. The mechanisms also permit coasting in the selected direction only. A brake, mounted on the yoke and controlled by a mechanism on the handle, functions to lock the wheel relative to the yoke. This allows the wheel to be rotated relative to the pawls, releasing locked-in-position pawls. Other selected modes may be used to lock the wheel in position to act as a brake or disengage the wheel completely to allow free movement.