Correct me if I'm wrong, but if your fridge runs on propane, you don't need an inverter. Our Dometic used to switch over to propane when campground power would go out. We wouldn't have a read-out on electric settings, but the fridge would still run and stay cold just from the converter in the 5th wheel.
We found while driving 4-6 hrs, the RV fridge would stay cold enough unless it was 90d outside. So we always felt safer turning it off along with the propane tanks when we move.
Now with a residential, like we have now, to run it while driving, we'd need an Inverter to go with the 2-6v batteries. The Converter alone wouldn't keep it running.
