When in freezing temps, I only hook up water and sewer to dump and fill my tanks. No hose to worry about freezing.
I keep my water tank topped off which means that it will take a long time for it to even possibly freeze. I put a 100 watt light bulb in the wet compartment to keep the water pump from freezing.
I also have one of those PORTABLE heat pump/AC units that works fine in cold weather. Puts out a lot of heat and I don't have to worry about it shutting off when the temps drop into the teens. The heat pump puts out twice the BTU's on the same amount of electric as a radiant electric heater.
Enjoy!