Most lower income whites support Trump because of Trump's stand on two issues: affirmative action and illegal immigration. Trump wants to end both.
Affirmative action does not create opportunities. It takes them from better qualified whites and gives them to less qualified blacks. In the United States the average black IQ is 85. The average white IQ is 100. That, rather than white racism, explains the persistence of black poverty. If Trump is successful in ending affirmative action, millions of blacks who owe their jobs to affirmative action will be fired. That will open opportunities for low income whites.
All immigration, not only illegal immigration, lowers wages and raises housing costs. It is as simple as the law of supply and demand.
I am not a Trump supporter. My hatred for Trump is visceral. I hate the sight of him. I hate the sound of his voice. Nevertheless, I understand his appeal to whites who are not rich, and who never will be.