Level when setting up may be different from level while towing. For level while towing, it is easy. Check the distance from the frame rails to the ground up at the front, and then do it again at the back.
BTW, I tried gluing levels to the shell. It didn't work, for exactly the reasons you say - the shells can move. Dave's approach would be much better. I do it a bit different. I simply put a 6 inch magnetic carpenter's level on the frame rails near the propane tanks, first side-to-side, then fore-and-aft. Seems to produce acceptable results, but I have to be sure that the level is in my towing-stuff box
Bill
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