People usually don’t decide to do things like that for shits and giggles, so let’s try and empathize with them and see if we can find some rational reasons for what they do.

Maybe they can’t afford the rent at an RV park. Maybe the rules there are so restrictive that the RV park is unusable to them. A lot of jurisdictions have restrictions on how long someone can rent space before they get legal protections or require additional insurance, so a lot of short-stay places like hotels and RV parks put a cap of a week or two for a stay.

Have you tried talking to these people? You can learn a lot about why people act the way they do by just asking them. Most people are rational enough that they have reasons for doing the things they do, and they’ll probably be happy to tell you if you’re friendly and treat them like people.