Fortunately at least one manufacturer is replacing all of their absorption refrigerators with household units. They did some really cool research and found that common new residential refrigerators only pull about 6 Amps @ 120VAC while running. That translates into 720 watts at 1 power factor. This means any common 1,000 watt inverter in any MH or TT can run it. The other thing they noticed is the residential refrigerators are over $1k less than even a much smaller RV fridge. How the company did this is clever, they pared an inexpensive inverter, charger combination unit with a automatic generator start system. That means that when the battery voltage drops below a preset amount the generator automatically starts, charges the batteries and then shuts down. The entire microprocessor controlled system is much less than the propane refrigerator cost! On towable units without a generator it would be more complex but I suspect it would still be cheaper even if you had to add an inexpensive generator. This would greatly simplify the whole topic about leaving the refrigerator on while driving, fueling, tunnels, bridges, and ferries. No one expects people to shut down their electrical system! I suppose you should disable the auto generator start feature when on a ferry but since they allow cars to idle they may not complain about a generator.
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
2014 Thor Palazzo 33.3 with a 2007 Tahoe toad