While the furnace ductwork is the primary source of heat for the belly, it isn't the only source. There may also be a direct vent into the basement. On my Cruiser there was a 1 inch hole in the bottom of the duct. Since I rarely use the furnace I sealed it off, besides it is just a waste of propane if outside temps are NOT below freezing. Anyway, I use two oil filled heaters rather than the furnace and even that heat radiates from the living area into the belly to a limited extent. When doing volunteer work, several times I have camped for days with outside temps below freezing and never had a problem with the tanks freezing. The most severe case was in Jan. with temps between 12 F and 20 F for two days. I don't think you will have a problem.
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Larry Day
Texas Baptist Men-Retiree Builders member since '01
13 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
11 Cruiser CF32MK
https://www.picturetrail.com/dayle1
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