I have been told that both the 8 cu ft and optional 12 cu ft. Refrigerators will run on 12 volts while traveling. I'm thinking about ordering a 337rls and since the 8 cu ft can't be opened with the slide retracted I am considering ordering the optional 12 cu ft model. At least with the 12 cu ft model one side of it can be accessed while traveling. I really don't want to travel with the propane turned on. So, being able to run the fridge on 12 volts would be a big advantage. Any insight you may provide would be great! Thank You!