Consider getting a 12 volt compressor refrigerator instead of the 3 way. The Dometic 8501 is susceptible to high altitude; I had one originally and in the owner's manual it states that altitudes above 3,250 feet may cause the unit to not function. When I returned to sea level it started working again. This is a serious limitation.
Of course, it does draw battery power, but, it's only 2.2 Amps per hour when it's running. If you have a solar panel system it will run 24/7 with no problem. My Nova Kool R3800 was a perfect replacement size. Door swing can be ordered either way and it is reversible.
Good luck.