The grapes of wrath how are the used car lot owners described in chapter 7

The narrator assumes the voice of a used-car salesman explaining to his employees how to cheat the departing families. The great westward exodus has created a huge demand for automobiles, and dusty used-car lots spring up throughout the area. Crooked salesmen sell the departing families whatever broken-down vehicles they can find. The salesmen fill engines with sawdust to conceal noisy transmissions and replace good batteries with cracked ones before they deliver the cars. The tenant farmers, desperate to move and with little knowledge of cars, willingly pay the skyrocketing prices, much to the salesmen's delight.