They are getting squeezed so tightly a lot of them don't even make minimum wage.
Business Insider covered this extensively, they found the typical trucker has seen a 21% pay cut since 1980 in real terms -
"Business Insider compared freight wages, adjusted for inflation, from the BLS 1980 area wage survey and location-specific wage estimates from the BLS' Occupational Employment Statistics. For the five cities in which comparable data existed in both surveys, wages decreased by 21%, on average."
https://www.businessinsider.com/trucking-shortage-eld-mandat...
https://www.businessinsider.com/truck-driver-salary-decrease...
According to the BLS CPI inflation calculator[1], $75,000 in 1975 would be equivalent to $362,000 today.
Business Insider has, shall we say, a very Capital-oriented view of the trucking industry, constantly shilling for low driver pay. Drivers who read it are always amazed that they never seem to mention that there would be way more drivers than needed if they could earn what they used to.
[1] https://data.bls.gov/cgi-bin/cpicalc.pl?cost1=75000&year1=19...
Trucking causes most of the damage to highways (fatigue damage), and the environmental costs of trucks are huge (fuel, rubber dust, brake dust) compared to rail.
It's also jammed with semis.
There's a lot of low hanging fruit in transitioning to rail.