the camper is mostly used for hunting/fishing trips and some road trips to see far away family and friends. When Im not near shore power I have a generator I can plug in as im stopped. If im in a place that doesn't want a generator plugged in and I cant plug into shore power then I can just keep the fridge shut. It's mostly to keep beer, yogurt and veggies cold, i dont really pack ice cream or milk. this option to me is cheaper because my fridge in the RV now is in need of replacement. and retrofitting a dorm unit with a power inverter is cheaper.
Even when I spend a day out hiking i'm not to worried about the fridge getting hot if it's not on. I can always toss the veggies on ice if needed. Plus the thought of needing to wait 24hr for an absorption fridge to cool off sound awful to me.