Happybuy Trailer&nbsp;Mover 350W 12V Electric&nbsp;Trailer&nbsp;Jack Max Vehicle Load 5000Lbs Trailer Jockey Wheel Utility Trailer&nbsp;Jack&nbsp;Easy to Maneuver Trailer Caravan Boat (12V/350W) 12V/350W Motorized TrailerMover; Max Vehicle Load:5000lbs; Max Jockey Wheel Load: 600lbs ElectricTrailerJack control box include the electric components, and protect motor from over heat damage Forward and reverse control,this jockey wheel mover features an automatic brake as well as forward and reverse gears on the steering handle This trailer tongue jack also comes with a height-adjustable clamp for easy attachment to your trailer; The non-slip rubber wheel will have excellent traction on tough terrains This jockey is a tongue jack and trailer dolly that easily moves most trailers up to 5000lbs; Easy to maneuver your trailer, caravan, or horse float ect