My trailer has 12V tank heaters and we will run the furnace at night to keep the trailer somewhat warm. Furnace temp is set to 50 so, it only runs when it is colder than that. In my 15 years of owning different 5th wheels I have never had an issue with frozen water lines in the camper when fall camping. We even had snow over night in northern WI with no issues at all.
Just saying this is how I handle fall camping.
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Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 145K+miles
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