Retreats and Cowboys offer optional refrigerator/freezers from a manufacturer called NovaKool. The fridge is a 2.4cf AC/DC model that only uses about 2.2 amps per hour when on 12v battery, and it switches to electric when you plug the camper in to generator or shore power. This refrigerator is solid, simple and has almost none of the frustrating & challenging cooling characteristics of the typical 2-way & 3-way RV refrigerators on the market. It does not have to be level to stay cold!
Lone Star & Lone Star Jr offer Dometic AC/DC coolers. 55IM for the Lone Star and 35IM for Jr.