I turn off the propane at the source (bottles) and do not run any of the propane fired appliances. The reasoning is that there is a very small possibility of an accident and I do not want to have a ruptured propane line ignite the trailer and possibly the truck. I have found that even in the warmest weather I do not need to run the fridge to have cool food by the end of the day. I may turn it on propane during my lunch break or any other longer stop in very warm weather. If there is material that cannot withstand freezing, bring it into the truck or have the trailer warmed before starting in the morning. Maybe I am anal, but I do not feel comfortable with the propane turned on.
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