Hi,
Winterizing is an option so long as you are prepared to redo it. My record was 7 times in one winter.
Using propane to heat may not work unless an extra tank is hooked up.
Are the water tank and waste tanks in enclosed heated compartments?
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.