Across ten doors I've had three turnovers in five years and one of the ladies that moved out (she wanted a larger house) still calls me occasionally to see if I have something available again. 

i only see suitably distressed properties hit the MLS very occasionally. 

They often (but not always) will accept financed offers, but pre-approval with the offer is usually required.Alternatively, some of the small/local banks will occasionally sell some of their repos themselves without listing them with a Realtor.

I could probably find better commission splits for when I occasionally do some Realtor work, but I enjoy having no office fees.

For HUD-VASH (the VA run program to help vets with Section 8 vouchers), the paperwork and standard of unit is virtually identical, but with the added support of your tenant having an assigned social worker who regularly visits them at their home, and occasionally will bring in other service providers if needed. 2+ Bedroom units tend to be in much lower demand for HUDVASH though, so bear that in mind if you're purchasing an SFR. 

And the occasional fire.

Build a reliable team on the ground, plan occasional visits, and trust your general contractor to handle the day-to-day.

But, I think in practice, "reverse trolling" remains ill-defined and a blurred line will rapidly begin developing. 

Make sure the tenant uses their own materials and is not assigned to do the job on a particular day - this can blur the line between "independent contractor" and "employee", which could affect things like you having to pay payroll taxes or workman's comp. 

Petersburg, I occasionally come across deals in Sebring and other growing areas.