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.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL