[jimcol]

When the cooling system on our 2006 started leaking ammonia I installed one of JC's AC/Propane cooling units. Worked head and shoulders above the original Dometic cooling unit. Coming out of storage the refrigerator would be cold enough to add food in about 3 hours. Held temps really good while camping with temps in the 90's. Only real issue I had was in high temp high humidity I was getting some icing inside the box. Solved it by adding a fan inside the refrigerator. I did have to disassemble and clean the burner once to improve cooling with propane. So I'm kind of a proponent of the dual source cooling units.
Our neighbors just bought a new unit that has the dual 12volt compressors. They are big fans having come from a traditional AC/Propane model in their previous rig.