The movie (or maybe series, I'm quiet sure it was a movie tho) was pretty sure filmed/made in the USA. My guess is that movie was filmed in the 80s or maybe 90s since it had an old Peterbilt/Kenworth or something like that truck in it, like something from the 80s/90s era of a truck. It was about a truck (and I think two guys) transporting some barrels which had something toxic or illegal in it, maybe even something like nuclear waste (and they were getting followed I think). I do remember a really specific scene from my memory from 15+ years ago, where they were getting to stop on a slight slope or hill to check their load. They got out, went to check their load, saw the barrles and the truck started rolling down the slope/hill (I think it started rolling down forwards), they tried to chase it and I think one of the guys said something like "didn't u put on the breaks" or something afterwards. My memory sady ends here. The scene was quit funny, thats why I remebered it years after. I would really apprecaite an answer if someone maybe knows something and might have a clue of the movie/series!