Our ACE will do that sometimes when the coach has gone out of perfect level. Of course we use the autolevelers when we set up camp, but if we are not on a cement surface, the coach will settle out of level during the period of a few days. We've learned the hard way to double check our level using a manual level before trying to bring the slide in (especially if it rains while we are camping). Not sure if your class C could be having the same issue
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