A picture would help, but based on your description I will take a shot. The way you describe it sounds exactly the same as a problem I had with my Rockwood TT. The "hard bubble" was the foam insulation in the side wall swelling up from water infiltration and pushing in on the interior wall of the TT. Even if this is not it, I am failry certain water is causing it. In my case, the problem was covered and replaced under warranty.
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