Personally I don't think whiteness votes Trump because it expects to be Trump, it does because Trump has ceaselessly signalled his support for a New Jim Crow. To get elected he literally toured the South hinting at Confederate restoration and heaping fear and scorn on migrants. MAGA is New Deal grand bargain stuff, and like FDR's program is shot through with race politics.
It's one thing to argue the incentive Trump offers his constituency is a stupid, and misplaced faith in the Great American Dream. But I'd say it's more marginal, local and cynical than that, it's about voting for the guy who says he'll give you the few per cent you've been accustomed to having.