Do you actually pay every time a seller just expresses potential interest in doing a deal with you, or have you found a feasible way around this?

I suggest checking the area in person and meeting potential future team members like property managers , contractors, lender, and etc is a good way to get into the right neighborhoods.

Try to get as much info as you can and find out what other parks are charging for lot rent to see what the true potential might be.Good luck!

Keep analyzing, love the house hack idea but definitely include that in your potential rent in case you decide to move out, have both scenarios and see what works for both now and in the future.

What’s the benefits for the homeowner and potential buyer?

And the latter is where you can potentially meet a mentor or find partners. 

Meeting PRO's and networking will help you with finding the right properties and potentially partnering up with other investors. 

I have found a lot of potential properties around a new casino in my area.

If you are able to find a property manager who simply looking for their monthly rent, and you have done your homework for potential income for AirBnBs in that location (as well as being familiar with the ordinances in your area), you can negotiate a clause to be able to list on STR platforms. 

You need to be sure that the flipper has nothing questionable.In general people tend to underestimate the time it takes to flip a home (especially people who are new) and all of the potential problems that can pop up.