I make stews with lots of veges and pasta/rice in them, vac seal them and freeze them before we go. Have steaks, snags, bbq food vac sealed too. Plus I blanched some veges, peeled potatoes, sliced onions and vac sealed all of them (separately) and had some frozen and some in the fridge. We crossed the border a few times so couldn't take fresh veges with us. Did that on our last trip through the middle to Alice and had 14 days of meals in the freezer, so didn't need to buy a lot when we got to Alice. (except "refreshments" for the trip home!)
To reheat the pre done meals I pulled them out of the freezer in the morning and left them to defrost in the back of the camper for the day, then at night I dropped the vac sealed bag into a bucket of water on the campfire and heated it. (Bucket of water was for showers and washing up later). That worked well - except the night we had a couple too many refreshments after a particularly long and corrugated road day and I forgot the dinner in the bucket. Went to take it out and the bottom had busted so there was a bucket full of watery chicken stew. The dingoes loved it!!
Oh we travel with an 80 litre fridge and a 40 litre freezer that run off the vehicle.
Hope that gives you some ideas.
