I asked the same question at the dealer last weekend.
He recommended if we are plugged in, to run the fridge for a day or so, so it gets cold. Then load up the fridge with our food and run it off propane while we travel. Because it's already dropped in temp, it wont take much propane to keep it cold.
Haven't tried it yet - but just thought I'd add his 2 cents.
Does make me nervous to travel with the propane running - but I'm a bit of a nervous nelly about that stuff anyway!
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