I understand your concerns about the Series LLC, but decided in favor that option, since I'm going to wind up with 8-10 owner finance loans under the solo 401k, and 8-10 individual LLCs seems cumbersome and expensive.  

I definitely agree with everything @Caleb Heimsoth said. 5.2% is very low as far as historical standards are concerned. 

The inventory of SFR is extremely low and prices are at all time record highs.

My concern here isn't time, money, or lack of deals, it's the fact my schedule isn't predictable in any form. 

Did they site anything in particular or were they extremely vague?

So far, it's been a good decision in that I've been able to learn landlord basics, how to do a cosmetic rehab, and live extremely cheaply.

One of the the tips is “fall in love with the ROI and not the real estate, don’t concern yourself with crime maps and school data.”

I guess that was my main concern in this whole deal.

My main concern is when title transfers there is a chance the bank will call the old loan due.

My concern would be that the tenant initiates payment on the first then I find out 5 days later they had insufficient funds.