was this one of you guys??

The video description says I-86 in Idaho, which has a semitruck speed limit of 70mph in most areas and most if not all semitruck's go that speed. The passenger car limit is 80mph. That guy was probably doing 80-85? and got hit by a strong crosswind and/or had a violent push/pull reaction with the wind around the semitrailer.

Speed is the problem.