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An electric tongue jack raises and lowers the trailer tongue with a switch instead of a hand crank. If your manual jack works for you, this is a convenience upgrade, not a necessity.
Trailer owners who hitch and unhitch often or find cranking hard.
Jack, Tongue, Manual, A-Frame, Topwind, 2,000 lbs (ASIN B007HRVY72). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B007HRVY72).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.