I've got a 110L Waeco DC fridge(CF110) in my van, love it. Unlike most(all?) RV type propane/electric fridges, it's a compressor rather than absorption system; it can run on an angle without having any issues, and isn't full of corrosive gas slowly eating out... (I once went to view a small travel trailer, having asked the seller to turn on the fridge the night before. When I arrived, it had failed in the night, and the unit was full of the escaped ammonia...)
It's definitely much bigger(and hence more power-hungry) than I need, traveling solo. It's probably bigger than 2 people need, really. ~65L would be more than
enough, and take less room in the van. But I got it used, locally, for a third of new cost... well worth it. Not having to dick around with ice is very nice.
Given the cost of
solar, IF you can rely on being places with decent amounts of sun, it may be more cost effective to go with a dorm-type fridge and simply add panels to cover the difference. At least unless you run out of places to put them...