There are many similarities in the challenges that both RV and boat owners face and refrigeration is an absolutely common issue. I replaced a number of refrigerators in boats in my many years and found only one manufacturer's product that I am confident in recommending. They offer standard sizes, but will also custom build most anything you need. Their standard unit is 12vDC and they offer the option of 120vAC / 12vDC auto switching for those who want the capability. What I especially appreciate is their remote compressor option. This allows for a larger refer internally while letting you place the compressor in a space where its noise cannot be heard. If you have an external locker that you aren't using that's in proximity to the refer, then you can place the compressor there. The company is Sea Freeze and they're located in Bellingham, WA. No, I'm NOT on their payroll. I'm just one of their many satisfied clients - purchased several units from them over 20 or so years and never had a problem, ever. When my Dometic craps out, I'll look to Sea Freeze for the replacement.