Had to be a little creative (when aren't you when building a teardrop) with the tongue jack. After replacing the swing-up jack with a verticle one, and installing a tongue box, clearance for the jack handle became a problem. It would not clear the box to turn. So I removed the handle, replaced it with a 1/2" - 3/4" pipe reducer, and made an adapter for my battery drill
(poor man's electric jack) to raise and lower the jack. Works great!