Corporations when labor is cheap: sorry guys, wages are dictated by the same principles of supply and demand that govern the price of all commodities. I don't decide your salary, the free market does

Corporations when labor is expensive: how dare you all threaten my power to set whatever wages I want

It's even worse than that once you account for all the truckers who are coerced into being labelled "independent contractors" and responsible for the costs of maintaining their rigs.

A confirming source, with more details, for the curious: https://www.theatlantic.com/business/archive/2016/05/truck-stop/481926/