Dometic has a kit (mentioned by the rep at the rally) that adds an extra fan on the back of the RM1350 for better operation in hot climates. Here's the Dometic reference info:
3108705.744 KIT, SVC DBL DR PWR VENT SKU # 9108554165
The Dometic rep at the rally confirmed this kit is available as a warranty fix. I called and spoke with Becca and referenced the rep's info. She offered to sell it to me. I asked if this wasn't a warranty issue as the rep had stated. She then offered to have a dealer install it for free. I suggested that I may be able to install it myself and save them the $100 of dealer labor. She got approval and shipped me the part for free. I've been on a long trip with the refrigerator working well, so I haven't installed it yet or decided whether to let a dealer install it when we get back to Texas. Looking at the instructions that came with it, I think the way it operates is that when the temp at the backside fins gets too high, for whatever reason, the extra fan turns on to move air.
The little blue fan referenced in this thread is available at Camping World for $20. It's just a cheap battery-operated fan that circulates air inside the refrigerator compartment. I have one and I believe it helps.