Can't speak directly about your coach, only in general. A duct from the propane furnace blows into the enclosed basement. Should have a return register somewhere. Ours is located in the side of a cabinet in the bedroom. Also some air will return under the bathroom sink, it's not closed up tight where plumbing goes down to water bay. That's the basics. At 65 I wouldn't think you should have any freezing in basement. Search around and see if you can find any return register, maybe you have blocked. Never looked but the Winnebago schematics, available on their website, may show the heat ducts.
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Hank & Lynda
2003 Winnebago Adventurer 35U
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