I can't say I care what the AC unit is, but it would be nice to have something a little more elegant than a simple shaker unit hanging out the back wall. I also don't need it to run on 12v. When I need AC I would either have a generator or shore power.I would be very suspect of a 12V aircon.
Designed for marine use at 48V more likely to be durable, have decent longevity.
There are some, super efficient, but still that's a lot of juice even at only 8000 btu.
Completely impractical to run off stored energy for more than a couple hours, better to just have a couple quiet Hondas purring away, use a big LFP bank and 5kW of panels just to cut down on runtime & fuel usage.
Best of all, go where it's cooler, why we're mobile follow the 60's and park in the shade