If you travel with your propane on for the fridge, you also have propane on at the tank, so you have propane lines pressurized going to the stove top, the oven, the water heater, the furnace and the outside propane connection. All of them fed by lines that are easily damaged and can leak. There is an open flame in the fridge. My fridge will stay plenty cold for 3-4 hours which and is about my limit for daily travel. I will turn it on when I get to my destination. Seen too many fires. While they might not have been started at the fridge, some were no doubt fueled by propane leaking. If I felt I needed to cool down the fridge in travel, I would start the generator for a while.