I had no idea how to deal with or interact with my tenants, despite my best efforts.

Your interaction with them must be solid and timely as well, with regard to providing all receipts for payment, how rent payments will be handled, and a monthly review of your financials.You can save a lot with in-house maintenance, IF the people responsible for performing it are knowledgeable and take a certain amount of pride in their work.

For example, info on whether they own a lawnmower, how they tend to interact with neighbors, if they like to have a lot of visitors, housekeeping standards, etc?

Any owner occupant would presumably have a monthly amount due barring an extraordinary deal. 

Call capture, QR codes, interactive augmented reality signs, text messaging options, and even links to virtual tours can be used to boost outdoor advertising performance.PPCPay-per-click (PPC) advertising can be one of the best methods of predictably and consistently driving in real estate leads on demand.

Both in the work you'll do, as well as the people you'll interact.

All kinds of interactions can lead to a bite.

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

I do have a fear that these high LTV Loans can present increased risk of foreclosures for market price fluctuations that are not that extraordinary.  

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.