A friend of mine (who happened to be a truck driver, BTW) recommended that you get the info on the truck if you can do so safely and then complain to their insurance company! That happens to be very effective. I used to see a certain Houston based oil-company's trucks driving on my daily commute through Fort Worth like they were late for a hot date. After e-mailing their insurance company with specifics a few times that suddenly changed. I still see them driving through town at least a couple of times a week and it's been a couple of years at least since I've seen one behaving badly. There is a DOT website (it's been a few years and I don't recall the URL off hand, but a search of google should turn it up) where you can obtain the insurance company contact information for any US-registered commercial operator.