We stay in NW GA in winter and have seen temps in single digits though rare. 20's and 30's are common. I seldom use the tank heaters, only when temps go low and stay there.
The furnace runs quite a bit so basement stays warm. Also remember the water in the tanks is not pure water, especially the black tank. Soaps and sewage tend to lower the freezing point a bit. I have had only one valve freeze and that was the last chance valve that is exposed. I usually leave that open when we're set up and the other valves closed but I messed up that once.
One could turn those heaters on when it's cold and leave them. They are much like an electric blanket and the thermostat won't activate them above 45 anyway.
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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