My parents had a propane only refrigerator in their 1963 model Phoenix Travel Trailer (see my profile to the left for a photo of it). I remember it took no electricity at all to run and it was always cold. I also remember it had a gas heater that required no electricity either. It had no fan of any type, it just warmed up everything around it. The farther away you got form the heater, the colder you got. Worked great in the Fall and Spring.
I remember, neither one of those appliances never failed. When my mother sold the trailer some 20 years later, the original refrigerator and heater were still working like they did on day one of ownership.
I don't think the model will make any difference. Those old refrigerators will run forever.