Yes, we leave the propane on. I didn't realize I should turn in off at the gas pump when I have my cigarette break.
When we had a motorhome, it had a 3-way (110, 12 volt or gas) refrigerator. We just left it on automatic and it would run on 12 volt while driving. If my memory serves me right, our old Flagstaff pop-up also had a 3-way refer. I wish our trailer had the same, but the 2-way works just fine.
btw, just kidding about the smoking thing. I don't smoke cigarettes.