Disclaimer: I’m a novice, so I may be off base.
I agree with Frank about letting the police handle it, but I would also look into getting a criminal trespass warrant (ctw) against the problematic individuals. I’m going through a similar situation (only imagine almost an entire park full of problems).
You said that you intend to non-renew them. Is your lease with the tenants or the home owner? We’re making all of our leases with the home owners because they’re the only ones with something to lose (we can evict their home). We make them responsible for dealing with their own tenants, including the costly process of eviction if they violate Park Rules. The landlord is also responsible for damage to Park property that’s caused by their tenants.
If your lease is with the tenants, who don’t own the home, I don’t know how much recourse you’d have against the titled home owner. I could be off-base, but that would be a concern for me. I want my lease with someone wo has some skin in the game.
I would also make it clear to the owner that if you catch any of the prohibited individuals living in one of his units, you’re evicting the home. We’re dealing with one right now that is rented by a guy who was arrested for making meth and crack; he had 5 guns in the home, including a sawed off shotgun. We sent a 60-Day Notice to Vacate to the lot (because we had no lease). The notice is up and I told the home owner yesterday that we were preparing to evict her home. She told me to go ahead and get rid of the guy. I told her that I’d be getting rid of her home. I’m not dealing with her problem at my expense.
I hope that made some sense. And again, I’m brand new at this and having more than my share of problems, so take it with a grain of salt and see what those with more experience have to say.