Ok. Now for some perspectives from someone who grew up "white trash" (me).

1. I think many from this background like the "simplicity" of right wing views that present a clear and different "other" that is to blame (immigrants, lgbtq, minorities, etc). When you grow up impoverished anger at your situation feels better than sadness. And anger at groups with which you probably have little contact is just easier.
2. The selfishness of many right wing pro business views appeals to them. It seems more honest. For the impoverished life is much more of a struggle and the universe itself is "mean". So it's hard to see policies that are based upon ideas of social good as anything other than contrivance and having hidden benefactors.
3. Heirarchical society, especially in the U.S., is built upon the idea of a zero sum game. We are all taught that, to quote HeyZues "the poor will always be among us". The impoverished are resigned to the paradigm that insists upon the existence of poverty. To suggest policies that would make a real difference are foolish because they don't understand.

These are just 3. There are many reasons. It's complicated, as most things are.

I grew up poor. Often in trailer parks. I come from what many would see as "white trash". And I am as left and progressive as they come. And while I was not from Appalachia, it was rural Missouri and filled with meth, trailers and poverty.
I will say that the majority of the people there were very right wing and sometimes fit the stereotype. But many also didn't.
When people talk in these generalities they always ignore the complexities of reality. I think this is one of the main problems with politics in general, now or during any other age. It appeals to people by simplifying things into easy labels by which we can self segregate. And I think the side that appeals the most to simplicity is usually more wrong than the other.
Of course, I am simplifying here . . .

I didnt finish reading this but will later. It looks like a great article. I hope it helps me understand their vote. I understand their life.

Thanks for posting !

David