[Bill.vannuys]

We run with the propane heat and hot water heater on when temperatures are at or below freezing in order to protect trailer contents and pipes from freezing. We recently did this at Christmas while travelling to/from Colorado. We set the thermostat to about 50. Prior to pulling into refuel point, we stop short and extinguish all propane devices for safety at the pumps. Then we relight after pulling away from the pumps. Our vents are clear with slides in to allow heat flow. I use a wireless thermometer that is mounted in my truck, so I can remotely track both the trailer inside and basement temperatures while driving.