I guess I consider myself very very lucky and fortunate. Having driven for 40 years, I have yet to have someone cut me off so close that I can't see their brake lights.
Let me tell you one thing though... Given a choice of hitting a car in front of me, or jacknifing my trailer, creating an ever bigger accident, all things being equal, the car in front of me, if he cut me off that close, is gonna have a big Dodge Ram tatoo on the back of his vehicle. I will do everything I can to avoid the accident, short of losing control of my vehicle and trailer.
Mike