Most jurisdictions ban propane being on while underway. The better refrigerators will have 3 way (110V,12V, and propane) the cheaper units just 2 way (110V and propane). Everything will stay cool between campgrounds unless you are driving a very long time, most folks do 4 hours or even less and is not a problem at all. Our unit on our new 5er is one of those residential units and runs on 110 all the time. We have a 1,000 Watt inverter and 4 T105's for on the road and boondocking backed up by a pair of 2Kw Hondas and coming solar. BTW, most non-crash RV losses are due to propane fires from the fridge. I saw one last year and it was fierce. Watched a big 5er go from a small fire to a total loss in a few minutes, the fire department just watered down the ashes. If you leave it on in a gas station and something happens that is likely criminal negligence leading to huge financial costs and potentially significant jail time if injury or death is involved.
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