I ordered one on Sunday and it's on it's way right now - this is the model Whynter ARC-110WD Portable AC Unit - Free Shipping | Sylvane
It's 11000 BTU but most importantly it's a dual ducted ac - a single duct unit will not work in an RV because it sucks air out of the RV which is replaced by hot and humid outside air killing the effect of the ac.
In my single slide Newmar, we removed the couch and replaced with a chair and ottoman so the unit will be installed in the front of the slide. I am doing a semi permanent install by cutting two holes in the side of the slide with covers - the unit is one of the few I found with horizontal ducts rather than angled upwards.
As we spend a lot of the time in the desert it will get well used.