Entering into a contract with someone for more than $5k such as a year’s lease on a space in a mobile home park? You’d better get ID, else you could possibly be tripped up by the Patriot Act. Credit (and eviction) checks on all tenants? Absolutely, especially anyone who suddenly shows up and starts staying on property - what if they’re a huge risk for eviction proceedings? Get them out before they establish residency and you have to go through a whole lot of trouble.
All in all, good luck with the lawsuit. Even with a sympathetic judge, I don’t think this is going far.
...Get them out before they establish residency and you have to go through a whole lot of trouble....
In States such as Michigan, just staying overnight can establish residency. Eviction proceedings are required if someone refuses to leave.