I just recently picked up a rebuild 2-door Dometic fridge for my 63 Overlander, and got a good look at the workings of the absorption fridges. I got mine from Crane's in Vallejo, CA. Only 7 hours drive from here....
Anyways, the electric function on my current refrigerator, a single door Dometic of 1971 vintage, works grreat since I replaced the heater element. It was a simple job, took about an hour or so.
I blew out the flue with compressed air, and now the propane function works better, too. While in Baja last March, Murray ( Creampuff) helpe dme save my food by cleaning the burner tube and orifice. we just got back yesterday from a 5-day trip through Californias Central Coast, and the fridge was usd in both modes, gas while driving, electric while camping. Both modes provided exceptional results. I had to turn the electric thermostat down, to keep food from freezing. This was on 70-75F days.