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I have used rubber coupling at Home Depot and it works great. As for as insulation there is a reflector piece on the coroplast that I assume is used as insulation but it is very thin.I don't think there is really any rv that I would consider 4 season. More like 3 season on account as much problem as we all have cooling these monster rv's heating them to me is more difficult unless you use strictly the central heat and that can be very expensive.
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