Propane tanks are designed to automatically shutoff if there is a massive leak, such as a broken hose. The fridge is designed to shut the propane off if there is no flame. There are many more serious things to worry about while driving than to worry about a tank with an open valve and a small burning flame.
I’ve been rv’ing since 1996 and always have traveled with a cold fridge, and full water tanks. When I had my Class A I carried over 100 gallons of highly flammable gasoline and managed to survive.
This topic has been discussed so many times and I promised myself I would keep my controversial opinions to myself....broke my own rule of self incrimination....