Yikes!!! Good thing he didn't kill someone. What caused that, inadequate suppression on the towing vehicle and not letting up on the gas pedal?
I never follow a semi close for fear of a rock stuck in between the dual wheels coming flying out or stop close to rairoad crossings if I'm first in line. A miss-inspected train car's brake shoe can fall out of it's holder when it's gets worn down and tumble along the ground and go right through a vehicle's window.