I concur with the Amish units, they are recommended in the two certified training centers which teach RV Repair. But, depending on costs, etc, Think about replacing the RV type with a residential type unit, first, it will keep the food colder. Second you wont worry about propane leaks, or cooling unit failures, or the main reason, FIRE. If you have an inverter it will provide enough power underway for the unit to run, and if you have 4-6 house batteries, you can still dry camp for a few days, alternating with charging batteries with the genset. The replacement costs are similiar, and you will like the residential one better than the RV one.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech