My Engel SB70 is 60quarts - that's on par with the size of the cooler (Igloo Ice Cube on wheels) we typically take on camping road trips for food (we also carry a smaller cooler just for drinks). Obviously we can't stock up on groceries for a full week or anything, but as we rarely stay in one place more than about 4 days, it hasn't yet been an issue for us, and I don't anticipate that being much different in our scamp
- since we can stock the cooler just fine for 4 days, with enough ice to last the duration, I expect that the Engel fridge will serve our needs just fine since we won't be losing some of that space to ice like we would be in the cooler, so we may actually be able to pack "more" food with us than before. We still plan on taking a smaller cooler with drinks in our tow vehicle because we tend to do that anyways
For the record, with the ice cube + drink cooler combo we successfully "road trip" camped for more than 3 weeks a few summers ago with 5 of us, buying block ice where possible when we stocked up on food, and we made/cooked ALL of our meals, no fast food or dining at restaurants... we ate lunch at a lot of rest stops and random city parks, and it worked out very well, and nothing we purchased went bad, and no one got food poisoning along the way.