One thing no one is talking about is battery cost over time. We all know purchase price of batteries is all over the map depending on brand, 12v or 6v, etc. But when you run batteries down to whatever degree you are comfortable with their life decreases. Yes 6 volt golf cart batteries are designed to be deep discharged, but the deeper the discharge the shorter their life also.
While a residential refrigerator costs much less initially and other features as described above, for boondocking I don't think it makes any sense due to replacement battery costs.
My Norcold does me fine and I'm using the same 6 volt T-105's I have had for the past 5 years full time.