Most positions that are under the teamsters Union, are not positions that require an education post graduating from high school. Didn't Trump always say he loved the uneducated? I'm sure it's no coincidence as his plain speaking resonates with them. Sadly, he would sell them out in NY minute if he could make money doing it. Kind of like selling people stuff they don't need like gold sneakers, Bibles where you can get them for free, ridiculous trading cards, and subscription-based comic books for kids about Trump - all things that uneducated folks would buy, unless they were even slightly enlightened by having, at a minimum, of walking through the halls of even community college, -they would tell him to pound salt. Selling bullshit is a conman's game- who's good at that- a Conman- aka Trump.
I'm sure some unions will have plenty of individuals who will vote for Trump, - the rest will vote for the party that supports Union rights and the gathering of individuals to better represent them.