Its getting to be very expensive with these new lithium rigs. Larger inverters , large solar setups and auto start functions to start the rv when the batteries become discharged. The EKKO might use a generator that runs off the rv engine to charge the batteries.
Lithium batteries need to be warm enough to charge so they are not an option for me due to cold weather use. Im staying with agm.
As for those fridges, they don't have a heavy amp draw and only draw 12 hrs a day not 24. I would buy a compressor fridge without hesitation. Some of the TC guys use them.
I have 200 watts of solar now but would double it for that 12v fridge. Thats all fine as long as the sun shines. Otherwise i would run the gen while camped or drive it.