So when someone was hanging around I told them to leave immediately or I will call the police. 

If this happened to me with a camera my first call would be the police department. 

Here is a list of due diligence item I use on my MHP investments:Check zoning and permitting compliance (city zoning)Check local law compliance (with Sherriff and/or Police)Search City Council minutes for any adverse mentionsCheck with State Department of Public Health's Division of Community Environmental Protection (CEP) for compliance violationsCheck with property neighbors for any disputes or pending legal actions Water - Check with water provider for any open or recent issuesSewer - Check with Sewer provider for any open or recent issues or complaintsElectricity - Check with electricity provider for any open or recent issues Rent roll with space number, name of resident, move-in date, renter or owner occupied, number of occupants, monthly rent, additional charges, current balance due and any relevant notes about the residentList of capital expenditures for the last 3 yearsGet last 2 years of Profit and Loss statementsGet last 2 years of Tax Returns for the LLC/Park12 months of Bank Statements for the LLC/ParkCurrent Accounts receivable statementsBuild proforma for next 5 years using rent roll and expensesGet owed taxes to City/County/Local govGet Insurance Quote of commercial liability insurance2 years of utility billsProperty Tax bills for last 2 years List of park owned home including copies of “rent to own” or sales contractsGet list of vendors and contract status for each vendorTalk with on-site property manager regarding issuesConduct Onsite Property Visit with property managerSpreadsheet detailing who pays all utilities including water, sewer, gas, electric, trash, cable, etc.

Call the police.

Can I contact the police for him damaging my items and asking him to cover the cost? 

I saw one of my tenants name in the police report section of the newspaper. 

We once had an ATTORNEY trash a Class A rental.Start with your insurance agent, but don't get your hopes up.If that fails then contact the police about the vandalism.

“We’re not the health police,” said Dickie.

Showed up with police and no one was home/mostly moved Out with belongings and trash left.

Within about 20 minutes we had sorted that the owner on title had passed and their heirs had passed without receiving title although 1 last heir remained in descending relationship, who was in a care center, and it was his niece who was his primary.