My brother drives for Wal Marche, and his truck will "tattle" on him if he exceeds the speed limit for more than a moment. The truck is governed, too. I think he said it won't exceed 65 mph if it falls off a cliff. But his attitude is that the company pays him to drive their truck, and he'll drive it the way they want him to. I believe he also had to agree to surrender his phone if he's ever in a wreck.
Since the conversation has switched from rural drivers to trucks, one of my pet peeves is big trucks drag racing up the hills. Here in my part of TN I-40 is a major E-W route for the trucking industry, and it's also hilly. There have been plenty of times when a driver has pulled into the left lane ahead of me to pass another truck, causing me to brake and follow him at 50 mph while he passes another truck doing 47 mph. I actually understand it, trucks run at different weights and have different gearing, but it's still DARN annoying to be stuck behind a truck for a mile climbing a hill.