I don't know what fridge you have, but if it's a 3-way, mine worked great on battery power while driving, and I just made a 3,500 mile trip from AZ to AK. I would have the camper plugged into my house the day before and start the fridge cooling down. I helped it by putting some blocks of ice in it, too. The day of, I'd load it up with already cold items, switch to batt power and go. Every time I stopped for the night, I'd hook up to shore power and switch the fridge to that and reverse in the morning before taking off. At one point I had to turn the fridge down a little since it was starting to freeze my milk. The freezer part also kept some steaks frozen even though I put them in there thinking they would thaw. I never ran on gas since I had either shore power or batt.
I looked this up, too, though since I had the same question. Apparently there's a pretty healthy debate on driving with the gas on since it presents a safety hazard, especially while filling up since there is an active flame along with fuel vapors. Many people said they do it all the time and shut it off at gas stations, others said they would never do it. One guy did say he actually lost his trailer due to a fire on the road.
If it's a two way, I guess you have to weigh the risks and know your state laws. I also had a Yeti-like Cabelas cooler that I kept perishable items in because I wasn't sure how good the fridge would work (again, pre-cooled). If it's a 3-way, I think you're fine using the system I used.
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