My local area has high property tax and makes me wonder about PA as an alternative. 

•Incoming Market Changes & Local News: Keep an eye on city regulations, new developments, and economic shifts that could impact STR demand.

@Tiana Lazard check with your local municipality, but unlikely you can claim homestead unless it is still your legal address - and you want tenants getting your mail.

All are local except for one is a national brand auto supply store, using this for a warehouse. 

Zillow, For Sale By Owner posts on facebook, your local newspaper, and craigslist.Wish you luck in your venture.

Passive Pockets, Meta (FB/IG) ads, local meetups are good places to find groups.2.

I found this deal from being a local.

Why don't you join a local landlord association?

It will be remote, but since you live there now, you probably already have connections who either already know the house or local friends to find you good people to service things as needed.  

Finding a potential lot won’t be hard but getting a local municipality to give you the green light to build an MHP is going to be next to impossible.