#1- pay down your debt, you can't make money in real estate until you have money and plenty of it-- those folks, more than likely, did it that way... a conservative approach, that served them well and probably because they aren't the riskiest of investors

If they start demo,and then never get back to that site, you're in a bad position as you've put in 100% and now have to put in 100% of the rehab as well when you take it back.  

whatever you stance on that, it has created a situation where we (americans) look down on factory built homes.Without the artificial input I believe we would have giant , efficient, factories in every city pumping out modular homes, that are green, affordable and accepted as "normal" and probably cost as much as a nice new truck.If you have ever built a new home, the insanity of "site built" becomes apparent as the waste of materials and man hours can be staggering.

In my county it is pretty easy to file a small claims action (and cheap - about $100 for paperwork and papers served).

Search the owner name, work backwards thru property appraiser/clerk if court site.

Here's a helpful resource:https://www.hud.gov/sites/documents/SERVANIMALS_NTCFHEO2013-01.PDF

States vary-and states like TX are much harder to get licensed in and require (as my memory serves me) 250K liquid per location to get licensed.

How do I verify that the insurance of the company covers the employees on site? 

This means that you create a listing, then it is sent to all of the major listing sites (zumper, rent.com, apartments.com, etc.) with one click!

I think the best place for you to start is to continue to educate yourself through the different programs/blogs/articles on the BP site relating to house hacking, including the different financing methods (e.g.