Commercial Vehicle Enforcement Class

Went to a commercial vehicle enforcement class last Friday. Most of the class was learning about big rigs and their parts, how the parts work, and what rules they are supposed to follow. Most of the rules they are supposed to follow are not enforceable by police, so I don't know quite how valuable the class was. I did learn quite a few things about the trucks and a few things that I can look for that may be helpful. It was only a one day class, though, so not too bad.