I have been employed by more than one business that relied on truck drivers from the USA and Canada crossing the border. As an employee of a large lumber mill in the 90s, I took it largely for granted. As a member of a Fair Trade Coffee Roasting Cooperative, there were a few times when the bureaucracy and security measures at the border significantly impacted my working life.
I did not even realize that cross border trucking was not a way of life at the Southern border of the USA until I read his story about the agreements that are being negotiated to allow just that to happen.
The Teamsters union, the Sierra Club and other interested parties have filed a lawsuit against US transportation officials.