I believe HWH levelers can be bought with a manual controls on a control panel inside but don't know details. Ours is the 725 auto level model (you can push one button to auto level or store the jacks or raise\lower them by pairs). Ours don't reduce ground clearance....there is a bar I would have to remove to get the spare down. They do use some of your weight capacity. Cost is in the neighborhood of $4000. It is recommended that they be installed by the factory in Moscow, Iowa or Chuck Stuart in Elkhart, Indiana. We used Stuarts.