Residential refrigerators

I’m thinking I am ok with the modified inverter. Have a 2000 watt inverter, four good house batteries that charge on shore power or the engine and operating the refer over last 3 or 4 days it works great. Refer is an 18 cf counter top depth by GE. GE engineering section says they do not test their refers on any inverter, “ however having said that” recommend pure sign rather than modified. Knowing the difference, I think that is the only answer they can or will give. Am aware of the advantages of pure sine over modified,starting load etc, etc, got it all covered. Just do not know how refer might perform over the long run. Knocking at 80 years old not even sure what the long run is, but I’m still RVing and plan to keep on .