I haven't done it in a Four Winds but I have travelled in below freezing weather in my prior Forest River Class C. My tanks, water filter and water pump were in an outside compartment that was heated and the tanks had heat blankets. I did not have any problems.
If your tanks and plumbing are contained within the heated space as long as the inside is above freezing you shouldn't have nay problems. Also, if the tanks and plumbing are inside you should be able to use an electric space heater instead of the propane furnace when connected to shore power.
Two things I learned for cold weather camping:
First, have enough water in the fresh water tank for toilet flushing, washing etc... in case the campground turns off the water system below 32 degrees. In my prior class C I would keep about 15 gallons in the tank and in the Challenger I keep about 25.
Second, when temps outside are going to be sub freezing disconnect your water hose and store it in a heated compartment. A frozen water hose is hard to roll and store.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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