Suburbanites barely went for Trump.
Your context is wrong.
https://www.jacobinmag.com/2017/08/trump-white-working-class-gop-rich-people
"Exit polls are imperfect. But according to the exit data we have, Trump did poorly among voters making less than $50,000 a year (roughly the poorest half of US society); Clinton won this group by roughly 11%.
Trump’s gains appear to have come mostly from the top half of income earners. In 2008, Obama and McCain each received 49% of the vote from people making more than $50,000. In 2016, Trump bested Clinton by 4% in the $50,000–100,000 income bracket, by 1% in the $100,000–200,000 bracket, by 1% in the $200,000–250,000 bracket, and by 2% among those earning more than $250,000.
These gains were significant: they constituted the vast majority of voters, at around 64%.
In America, the top 10% amounts to around 30 million people. A 2% gain among this politically influential group would be immense, especially in an election where Trump lost the popular vote by three million.
The bottom line is this: Trump consistently outperformed Clinton among the most well off, not the bottom half."