We are full-timing, and have to be in the Salt Lake area. We have a Valterra heated water hose (well worth the money) and a small amount of heat cable that I put around the park water supply and our pressure regulator. I also keep a couple of feet of the split-insulation for pipes to put over the top of that. Temp was about 12F this morning, and nothing frozen.
We also keep the water tank full. The way Grand Design set this up is great. If the park water has to be shut off (happened 2x last summer/fall), just flip the switch to turn on the water pump. No other changes required.
