j/k
Just happy to see he's allright, I went along with a friend of mine who is a truckdriver for a week (trough Europe, proper truck btw), and I know how heavy those things can get.
We ran over a hare, we heard a light tudd, never felt a thing.
If a guy in a car would run into the back of a trailer at aproximately 50km p/h, you wouldn't notice unless you have the windows open, engine shutdown and no radio playing...
Only way to get hurt in an accident driving a truck, is when you run into another truck, or some other solid thing.