We use a portable aircon in our RV's garage (Class A Toy Hauler) because the factory set-up couldn't keep up in the southwestern heat.
We use the portable in the studs and stucco too, so it was not a wasted purchase like if the intension is to repair a rooftop.
The only issue is the warm air exhaust needs to exit the RV. In our portable that is a single dryer duct style tube. And some portables use 2 ducts for compressor in and out to not waste the aircon on the compressor. You need to figure out how the duct will exit the RV.
Best luck
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