As has been mentioned, going to an electric compressor fridge has some distinct advantages. We bought an Engel MT-45. It can be a fridge or a freezer. It is 12V compressor, but is built in to use 110AC too. It only draws max 2.3 amps on the 12V side. We currently only have one group24 Walmart battery, and the fridge has been on for a week with the camper unplugged and the battery was still plenty good. We carry a 30 qt Engel cooler/icebox for when we want to have a freezer. We move the fresh to the icebox, and then just turn the knob up to freezer mode. Then we have a 45 qt freezer! We usually don't have a lot of frozen while camping, but being able to freeze up a catch of fish! Or have ice cream for a night.
I have seen people mount them on a slide in the place of the old refer, or you can re arrange the camper like we did...
Put the fridge where the sink was, and the sink where the fridge was.
