Trump’s ‘Working Class’ Support

The Mythology Of Trump’s ‘Working Class’ Support (FiveThirtyEight)

This article is very interesting.
Exit polls might show that average Trump voters are not very poor, although low-income voters are statistically underrepresented in the GOP.
In the questionnaire, the last question is about "2015 total family income", which is not easy to answer accurately at the entrance of polling stations. They might want to appear to be wealthier than they really are.
There is no question about their occupation. There is no evidence of their "class" consciousness.
I wonder which description is more appropriate. Are they "aggrieved" whites or relatively wealthy whites?