I just picked up my new 5th wheel and was a little concerned about something the dealer told me about the fridge. I'm used to an older 3 way model which ran on 12v while we were travelling. The new 5th has a 2 way fridge and I asked what you do when you are travelling and he replied that you just leave it on propane. He said the new fridges are able and safe to leave burning on propane even while you're moving. That goes against everything I've ever heard. Was he correct, or just giving a salesman's usual response (anything you want to hear)?