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 . . .

My father in a life time of working very hard managed to raise himself from working class to lower middle class and in all that time always voted Tory and held very right wing views.
I asked him why once and his answer stunned me "I vote for the people who understand money"
I pointed out the people he voted for only understood two things about money, how to steal it and how to hold on to it.
He nodded sagely and tapping his nose said "Exactly" as if this explained everything.
He is a fine example of the mentality of the poor who feel that somehow granting the favour of a vote to his "betters" will some how oblige them to look after him.
He hates socialism but demands his old age pension as a right, his free NHS medicine, eye care and dentistry and will not believe that they did not come from "Mr. Churchill" winning "the war" which they did not, our health service and welfare state are all products of socialism.
This is the problem with many of the "Greatest generation" they are convinced that people should know their place, be grateful for scraps, and worship the upper classes as benevolent god who they hope will smile upon them, pat them on the head and tell them what good boys and girls they are.

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