My understanding and from what I've seen is that a propane fridge still vents a flame out. I'd be real careful if you're driving with that on.
I usually load the trailer fridge a day or 2 early. If you have frozen stuff, it takes a long time to thaw in that fridge. Unless you're driving for hours and hours. We drove north of Edmonton from here last year and nothing showed a slightest sign of thawing.
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