Aside: I met Rick Goff when I was in high school. My dad lived in Yamhill and was friends with him. One day we drove out to his place, turning off the gravel road toward a barn. Stepping inside the barn was a surreal experience. There, out in the middle of nowhere, in a fucking barn, was a freshly painted 1950's Rolls Royce. It was beautiful.
I don't know if he's a good example of the economic class divide, though. I understand Kristof's larger point and that he's writing from his own life experiences, but I think Goff's situation is more demonstrative of the rural-urban economic divide than a class divide.
He had a skill that people were willing to pay him for, but he chose to restore cars out in the country, in his barn. I can't speak for Goff's life choices, but during my summers in Yamhill and having relatives that lived in rural areas, I met a lot of people who would rather eke out a meagre existence in the countryside than move to where the jobs are. Part of economic mobility is just plain mobility.