I live in the East mountains and have traveled a lot in the winter. You can un winterize the trailer, fill the water heater and partually fill the water tank. With the water heater on propane, the fridge on propane and the furnace on low you will be good to go. Turn your water pump off and open your faucets, you have just freeze proofed your trailer. I really would make a reservation in Demming (early) and probably in Casa Grande, break the trip up, a mad rush to the coast is not required or desired. Stop in Dateland and buy some dates, take time to look around as you travel, it takes a lot of low temperatures to freeze damage a trailer. I lived in my 5th wheel up here when it was 20 below and the wind was blowing hard, had a minor freeze up but a well placed electric heater took caro of the problem. Enjoy your trip, don't look on it as a survial situation, have a nice easy winter trip.
