I'd love to see a 5er that has been prepaired for an air pressure test! There are many, many leak points in my Montana. Some of the openings are very large, like the entry point from the fresh water tank to the water pump and all the heater vents that have access to dumping air into the undercarriage.
I'm not saying that it can't be done but it must take a lot of work to build up any meaningful pressure.
Craig
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