2 people, a week or less between food shopping, a 30L or snaller fridge should be plenty big. For me refrigeration is the biggest convenience/neccessity. Everything else is real flexible once you have keeping food fresh figured out.
Next concern is being bear safe so sealed dry storage is nice and keeping EVERYTHING with odours INSIDE the vehicle.... garbage included. It is nice if you can sleep a distance from those food odours. Growing up in bear country we set up the food, cooking, eating, living on one side of the car.... and the tents, sleeping on the other side.
Are you a food guy or is food just fuel. If food is fuel, a backpacker single burner works. If you love to cook, the sky is the limit but USED will save a lot of money. Brand new fancy stoves, skottles, BBQs all do the same thing, they burn a flame to cook food. A 60 year old Coleman works as well as anything.... maybe better.... but buy white gas, don't cheap out with gasoline.
No matter what the fuel, white gas or propane, try to store the fuel outside.
While weight is always an issue if you like fine china and silverware go for it. Tupperware and plastic are only practical if you like take out food.