I use their screening service to screen potential tenants and their reports are thorough including credit, income identification, criminal record and rental history.

That's absolute criminal!

Their ability to pay and a criminal background check is more important but we still run a credit check. 

I say what I think and it not meant with offence.

He doesn’t have any major criminal offenses or property damage history.I agree about proceeding with background check.

I do not care about credit score.What I care about is non-medical / non-student loan related collections, liens, judgments, repossessions, criminal convictions, prior landlord and personal references, time on job, income, communication skills, ability to follow directions, etc... and my tenant screening process focuses on these things.

Oh, that and a clean report on criminal check.

For example, just mentioning you will run a credit/criminal background on every person 18 or older will stop about 1/3 - 1/2 of all inquiries.

Criminal matter I dont take lightly and wil not discuss with police until my attorney is consulted first.

Vehicles, equipment, inventory, accounts receivables and orders, your security is accomplished with an agreement and/with UCC filings.When doing due diligence in such an opportunity, begin with him personally, then his business history, then financials, then compliance issues that may be applicable, then employees, with employees, look at criminal records, pay being customary and work history.