OK - back from my first trip. First I have to say the A126 was a dream for my wife and I. We really enjoyed the camper and even as novices (our camper wasn't well organized for our few days of living) we felt like it was a total success. Only had one Sput (put the regulator on the camper hookup then host to the spigot, it leaked like crazy and I thought the hookup was busted until another camper came over to check out the a-frame and suggested I put the regulator at the spigot (logically) to stop the leak).
Regarding DC Fridge: We pre-cooled the day before on 120vac (empty) and then filled it prior to leaving with cold food/drinks for the trip. The temp when we left inside the fridge was about 34F. We switched to DC after unhooking the AC from the house and were connected an on the road within a few minutes. I left the thermometer in the fridge and checked when we arrived. Inside of the fidge read 37F (within the range of fluctuation observed while on AC shore power).
Voltages: I have a negligible drop of voltage between the battery posts and Bargman plug (7-pin round plug), about 0.1vdc.
I had hoped to check the trailer battery level before leaving, and again after arriving at camp (before going back on shore power) to see how much (if any) drain there was on the battery during travel running the fridge on 12vdc.
I didn't however feel my numbers were right. For some reason my DMM was reading 16.23vdc when checking the voltage at the trailers battery posts after unhooking shore power (before leaving home, fully charged). I'm sure I'm overlooking some 'rule' as I'm not an electrical guru but something didn't seem right about seeing that kind of voltage on the battery. However, I did check once arriving at the camp site and unhooking the trailer from the camper, voltage read 16.19vdc on my DMM so that's a negligible change in voltage.
Why am I seeing 16.23vdc on my fully charged 12v trailer battery? Doesn't make sense. Could it be a grounding issue? I was measuring across the pos and neg battery posts with the trailer unhooked (I believe the leveling jacks were down).
Overall however I believe that in my setup (2011 Jeep Wrangler 2 Door, with Mopar OEM 7-pin wiring harness installed to factory recommendations) running the fridge on 12v while traveling is going to work fine. That eliminates my need run the LP while traveling and simplifies things (for me anyway).
2011 FR Rockwood Premiere A126 Hard Side
TV=2011 Jeep Wrangler Sahara 2 Dr
Reese 66065 WDH, Curt WDH Shank #17120
Prodigy P2 Brake Controller, Mopar 7-pin Harness
B&M Transmission Cooler (#70268)