http://www.businessinsider.com/exit-polls-who-voted-for-trum...
Every income group over $50k voted Trump. If you scroll down you see that rural voters did indeed go for Trump, but they are much smaller proportion of the population than city folk or, the largest group, suburbanites (who went for Trump solidly as well).
I don't have a source handy for the poor being largely non-voters but I've seen hundreds over the years, it's well-established fact.
>Given that most people seem to attribute the swing state losses to the 'we need jobs' votes coming from the manufacturing and steel industries
Most people might make this attribution but it is not correct.