John,
Spend the money for an automatic leveling system, then you just have to push a button. They start around $150K and can spiral upwards considerably. If you need a picture, I can provide one. Unfortunately it has a vehicle attached to the back.
Sorry! Couldn't resist. But they do make auto leveling jacks for 5er's. Don't know if you would have to beef up the frame or not.
Edited: Spelling.
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