I put a set of those Hopkins levels on our 5th wheel using only the double sided tape. They stayed on there for a good 7-8 years without noticeably moving; the bubble seemed to get larger over the years though. When we traded the 5er in for the Axis it still had its original refer which worked as good as new (aside from some circuitry issues caused by a recall).
I've found in the Axis that if the camper is really out of level then the refer actually heats up instead of cooling down! Our front driveway is really sloped: The camper is more out of level on our driveway than it has ever been at any campground (I have to use 15--3 packages--of the Lynx levelers to get the front up high enough for it to even be close to level. It works out to something like 6" of lift).
Hmm never thought to compare the EZ Level with my torpedo level...may have to give that a try after everything thaws out.
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