I'm so happy for you propane guys that have had good luck. I am going by MY past experience with a 1988 Northstar, 1992 Caribou, 2004 S&S and a 2007 SunLite, all with propane and none of them were safe to keep food!!!! (needs UNDER 45 degrees).
All campers I bought used except for the S&S. And it spent so much time in the shop trying to get the fridge to work I just gave up on it.
Then I bought my Engel. I had 34 degree beer no matter how level I was or the triple digit temps.
Hardcore off road campers (Four Wheel Camper) are now offering 12 volt fridges.
I just got back from the desert and I tell you what did work good. I had bought a 12 volt Igloo cooler from Costco. It is a less expensive unit without a thermostat. Runs constantly. I filled it with beer and plugged it into my truck. After a few hours when I reached my campsite I had ice cold beer!!! I unplugged it at bed time so it would not run the battery dead. But for what it is, worked good!!!