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Hello Richard,
First of all wecome to the MOC Forum.
I'm familiar with the bubbling, have some of my own, but not as many as you describe. Been watching them for a year or so and so far not a problem.
The thing that intrigues me is your comment about a possible membrane over the rubber roof. I'm very interested in what the RV Tech. has to say about this. Please post his comments about this.
Thanks and Happy Camping
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