My owners manual is in the coach, up at the storage facility, but I recall seeing a page that talked about recalibration....essentially, you level the coach manually to your liking, and then there is a series of button pushes...like all four arrows at ounce, then enter...or something like that. It resets the level box (mine is down in a bay) to the new level position. And yes, mine would work fine on completely level surfaces also.
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