These are amazing ideas and what's great is your meetups would be a great place to ask these questions as well! 

Well, here goes nothing.

Upon inspection the appraiser will see the crawl space and see it was a mobile home plus a HUD tag and public record.One of the requirements in mobile home financing is the property "Must" be on a concrete permanent foundation(in order to be real property) on top of that it requires concrete pillars, skirting and the "Well and Septic" dug and placed within legal distance from subject property.

There are some hyper specific forums on here as well for everything under the sun, and tons of amazing articles.

If they're cash flowing super well, why sell or take out a HELOC? 

Then, I would share with them how you manage properties and what your expectations are for them as well as you - essentially explaining how you work with people renting from you.

Many investors fall into this "do-it-all" trap, believing no one else can handle things as well as they can.

This could be happening to you as well. 

Well, then I'm interested in seeing the answers out of curiosity.

Narrow focus - I know the zip codes I wanted to purchase well.