Commercial real estate investing is largely a matter of analysis regarding financial data, conservative projections based on that data, and market/feasibility.  

If he doesn't pay, take him to small claims court or just figure protecting your investment was worth another $600.

I now realize that working for someone else will not get me where I want to go financially.

So protect yourself and obtain some intel fom a Real Estate Attorney who has experiences with Mobile Home Parks.

.   -- I worked with IRA Financial GroupMy other unanswered question is - since he rolled over his IRA into the solo 401k - do I - as the 401k plan provider- need to document to the IRS that we received this distribution into the account?  

@Danny Wu I cant answer that question right now but as I learn more about this area's market i'll talk to you about it. look online and do some research @Sean Lauber , my job pays me very well, but I'm looking for more financial independence.

If you just want secondary income, you won't need to buy as many as you would if you want complete financial freedom.

But never really financially had the means to take the risk.

I sat in on a board meeting before purchasing, and went through their financials.  

I'm eager to succeed in this as I want real estate to be my avenue to financial freedom!