If the cats can't tolerate being inside the motor home at ALL times, maybe get a large foldable dog crate to put them in for them to get some air and a feeling of being outside. This is what my sister in law does at the campgrounds. He is an indoor outdoor at home. There have been several times that he escaped at the campground and was really hard to catch him. If you don't want to be going home minus a cat or two, you should take precautions. A family that travels with hand trained birds lost one of them in one of the campground and it was heartbreaking. When these pets are in unfamiliar areas, especially with dogs, noises, people and traffic around, they can get disoriented. I have also used one of those pop up zipper screen houses for my cats to sit in while we were outside-just some thoughts.