My family's bread and butter is trucking. My father owns a company, two uncles drive trucks, my brother and two cousins are mechanics.
Yes, it is fair to say that many truckers are big-block lovin, manly men.
However, i think the reason for lack of change is financially driven as you'd expect the reasons FOR change to be. With a sudden up-shot in deisel prices, many companies are struggling in this industry. You can't just change your fleet over to more efficient trucks. A new "typical" truck is like a hudred grand. Some technologically advanced engineering spectacular would cost much more. That buys a lot of gas and uses a lot of money that these companies just don't have right now.
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