Propane..unlawful to have fridge on...is incorrect...

Since my Class B refer is 3 way I travel on 12 volt, unless it is a short drive. I'm surprised all rv reefer's aren't 3 way. I do make sure to have it off when refueling as I worry about flames near gas fumes. My long distance driving has the main propane valve off. If an accident occurred with an open propane line that could be explosive. Now these 2 concerns are almost never going to happen, but if they do you'll know - boom. No need to risk it with a 3 way.