Anecdotal, I know, but everyone I know who is voting for Trump is essentially doing it for two reasons:
1) Not Hillary
and
2) The Problem With Our Colleges
Specifically, over the past few years, as the media has picked up on conservative speakers being banned from speaking on campus', students feeling threatened because of a Trump 2016 chalking, Mellisa Click, et al Middle America really isn't happy with what they perceive as fascism and anti-white, anti-American demagoguery coming from tax-funded universities.
I'll make no judgement on how correct their perceptions are, but the dozen or so 'older' (my age, 30-31ish) people I've talked to who will admit they are voting Trump bring both those points up without fail.