I replaced the fridge in my 5er with an apartment size fridge.
I have a Xantrex 1000 watt pure sine wave inverter and two GC2 batteries in series.
With a full charge on the batteries, I get 1-2 days depending on conditions.
2004.5 Dodge 3500 5.9 Cummins, NV5400, 5" turbo back stainless exhaust, Edger programmer & 22.5 Alcoa's
2002 Forest River 36 5th Wheel (staying home)
1992 Jayco 29 5th Wheel (Mexico veteran & headed back)
2002 "faux" Wanderlodge 40' My new toy....