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You need to level side to side first then do front to back. If you can find a helpful person who has a 5er with a hitch in his truck ask for help otherwise you will have to jack up the door side to put boards under the wheels. Is the ground fairly stable where it is parked? Are you sure your rig does not already have leveling jacks on it? Read your manuals too to help understand the systems.
Yes the jacks operate on the trailers 12 volt battery. Are you able plug into power while you are building? You will have to have a means to keep the battery charged if not.
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