We had one loner and then got two from the same breeder, different litters that get along most of the time. They used to chase her, so we let our daughter take the older one.
Back a few years ago, I saw a Truck Camper pulling a small flatbed trailer. It had a huge cage that the cat would sit in during the day, watching the scenery and wildlife. We've also seen something similar but it housed a parrot.
Another MH owner had a wire dog crate they put on the patio and their cat enjoyed watching the ants and bugs that came inside the cage.
Luckily, our two are both indoor only and sleeping by a window in their cat tree is all they care about what's happening in the outdoors.