The guy in that first video has a death wish.
The second video I watched twice, that guy must have hit hte truck at least 25MPH, he was braking. The guy in the pickup was right there, sees it, gets out and immediately walks the other way? Obvisouly this was a chase, so maybe he felt threatened? But after the guy plastered himself into a 53' rig? Good thing he was wearing a helmet, now he can think about it in a jail cell.
Those stunts on the last video were pretty good. That one guy was wearing jeans and dragging behind a Busa. Mmmmm... ouch.