We travel with our fridge on propane. Back in the day, when they made 3-way fridges, we used the 12v option on the road, but that's no longer available. Frozen food does fine, as does everything else. I make a list of potential meals, from that make a list of groceries needed, and pack what will fit. With no pantry, it takes some creativity, but we can get about 5 days' meals in the fridge, drawer (which serves as the pantry) and a few sections of cupboard. You'll figure out what will fit over time. There always seem to be grocery stores not far from where we camp, or the ubiquitous Walmarts along the way.