Lippert Power Stance™ Electric Trailer Tongue Jack - 3,500 lbs. #813748The Lippert Power Stance tongue jack #813748 is a game changer. Equipped with an optional 2 way to 7 way plug power system, you can lift and lower your trailer using your tow vehicles power. No more draining your RV battery and no more manual cranking. 2 way to 7 way plug powering system (Power Swap Auxiliary Cord required) Easily raises or lowers trailer tongue with the press of a button Helical cut gears reduce noise and improve operating