I think you've gotten some good advice in this thread. I don't think it's advisable if viewed solely from an investment perspective; however, if part of your motivation is to help the guy and you're willing to accept the possibility, however remote, that you won't receive some or all of what you're promised, then have at it. Bear in mind, that a lawyer will likely charge you $500 or so to review the paperwork, so you should either tell the borrower that he needs to pay that cost or you need to factor it into your decision.
“I think you’ve gotten some good advice in this thread.”
I think so too. (Well, except for gettin some hiney.)
A part of our motivation is to participate in some way in the success of his business.
I expected to receive good advice here. Thank you, all.