hours a month I spend on I-15 between Utah County and St. George? I didn't deny that truckers can do stupid things, but car drivers are worse as a % and it's not even close.
Also, I wonder if this phenomenon you mention happens more often in other areas. I have a habit of always looking at the driver of a car or truck as I pass them or visa versa. Most truck drivers between Provo and St. George are "deplorable Americans" not foreigners.