We just finished going through the winter in Ohio. Only had lines freeze once after that we left the water dripping in island and bathroom sink and left cabinet doors open. Besides that we purchased a Camco heated water hose, used electric heat tape and insulation around the campground water supply. I also made a box from insulation board and had a halogen work light for heat under the tank area. The other thing I did was to make sure the furnace ran every half hr to an hour depending on how much the temps fell below 32. With those things and running the fireplace heater and an additional small electric heater we stayed plenty warm with no water freezing issues. Just make sure to run the propane furnace often enough to keep the underbelly warm to prevent lines from freezing.