If the coach shakes when up on the jacks, put them down a bit further. You haven't lifted enough weight of the suspension, so you are being partially supported by air bags (or springs) and partially by the jacks.
After leveling, the jack foot may sink into the ground (or pavement) a bit and let it start jiggling. It may take a few hours or a few days for this to happen, depending on the firmness of the surface.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL