Heating basement in the winter

It looks like the average daily lows are not much below freezing and the average daily highs are well above freezing year round in Pigeon Forge. Much of the time you probably would not need to do anything to prevent freezing of tanks in enclosed basement compartments, doubly so if the RV is generally heated in some fashion or another. I suspect (but do not know) that the pipes are all inside the insulated portion of the RV, rather than being outside or in the basement area; that's generally the case for RVs that are set up to be usable in freezing weather.

According to the specs I see online, a 2014 Tiffen Allegro Red 38 QRA has a 24 gallon propane tank, or around 80 pounds usable capacity.