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Smart is an understatement when it comes to this RV trailer jack. Designed with the same durability and strength as our Power Tongue Jack the Smart Jack takes raising and lowering a-frame trailers to a whole new level. The Lippert Components Smart Jack features hitch height recognition mode. Once the hitch height is set the Smart Jack will store and remember that information until a new height is stored. To set this up first measure the ball height on the tow vehicle once unloaded. Next extend the Smart Jack to a distance that is 4” higher than the unloaded ball height. Lastly set the hitch height by pressing and holding the up and down arrow buttons until the interface flashes.