Important to remember that Trump didn't bring a lot of new working class voters to the GOP. White working class folks voted Republican in 2016 at about the same rate they have been.
He *did* have a lot of upper-middle class folks switch parties to vote for him. And in both elections, about 60% of folks who voted for him were in the top 50% of incomes.
White folks without a college degree are the majority of his voters, yes, but it's not limited to those making under 50k.