I got a 26 quart joytutus fridge and its about the right size for me, I use to have a 43 quart edgestar which was too big for my van. Right now I have a bag of fishsticks, bag of taters, some frozen vegetables, bag of taquitos, and also a gallon jug of frozen water. The frozen jug I just keep in case I lose power, I could always remove if I needed more room. 26 quarts will easily store enough food for 1 person for more then 1 week.
All that food last me several weeks since I also eat can goods. I added insulation to the sides/top of the fridge and got it to maintain 12 degrees F using 26ah of power per 24 hours. 12f is good enough to keep that food frozen, I even kept ice cream at 12 degrees for weeks but it wont be frozen solid. I bought the joytutu because you can fit a gallon jug of milk in it standing upright and it only weighs 26 pounds empty.
Whichever fridge you get make sure you vent it, in a hot day, they put out alot of heat. Two weeks after I bought the joytutu I was already regretting the decision, out of the compresser vents I was getting 110 degrees of heat. All that heat in a already hot van, makes it unbearable quickly. I use flexible ducting and vented the fridge to the outside, heat problems are gone. 3 months later very happy with the fridge.
Thanks jonyjoe, I may have to think about the heat and a ventilation concept. I'm already thinking about a "user friendly" secondary enclosure for whatever I get so that it doesn't run as much. So about an 1ah / hour average.... take care!