Are all jacks in firm contact with the ground? We level by dumping air, then extending the low side jacks first, then dropping the opposite side jacks to engage the ground.
At one point, we had an issue with one jack not extending fully. Fixed that.
Also, a few months (and several thousand miles) after she became ours, I was crawling around underneath and found that the driver's side front jack mounting plate was missing two of four 1/2in bolts. The other two had the nylon part of the nylock nuts just barely on the threads. Easy to swing the jack assy by hand. Really surprized that didn't fail. (N0, now that you bring it up. I do not crawl around under there while she is up on jacks)
Fair Winds and Following Seas
Terry & Rosalina
2007 Winnebago Journey 34SE
Retired Navy Mustang & Navy Wife