Using the Cabover in Freezing weather

I have used my camper down into the low teens without trouble. I keep the temperature at 65 degrees and the inside compartment doors open so warmer air can circulate around the waterlines. I don't think your Pastime has a basement so all your tanks, fresh, gray, black, are somewhat more exposed to the inside air than my basement tanks to keep them from freezing. My camper sits on 1" of foam board and also hasit attached to the sides of the camper tub.