For easier 'installation', you may consider one of those indoor a/c units, that sit on the floor, that have a dryer duct tube that you route to a window for air intake for the a/c.
We have one that we put on the floor in the stand-up closet of the truck camper (about the size of a very small bathroom) and run the hose to a window. Got it for $75 used on Craigslist. Runs on 110vac. I haven't tried it with a small generator. I have a 4500 watt gen that runs it fine.
This eliminates mounting a window a/c unit to the camper, or needing a stand to set on the ground outside the camper that lines up with a window.
