The tank heaters typically come on when temps are below 40F. The don't get really hot, only really have to keep the tanks above freezing anyway.
Fresh water tank is usually inside the heated area of the coach and thus if you're warm its warm.
If you keep the coach warm enough for you then you shouldn't experience any frozen pipes. I'd pick up a gallon or two of RV antifreeze and dump some down the drains after emptying the waste tanks--the tank heaters work on the tanks but not on the valve area. Having a bit of antifreeze in there will give you a bit of extra insurance.
Keep an electric heater handy: You'll go through a lot of propane. Using an electric heater to supplement that will save some propane.
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