Core Insulation

I was driving on the interstate today and passed a Core Insulation truck( Plate number BBG 27U) going slower than me. After I passed them, I hit some slower traffic in the passing lane trying to get around a semi truck, which is no big deal, but this truck(who got behind me at this point) whipped into the slow lane and guns it trying to beat a 4 car train before this semi truck. They didn't make it but he was acting like they were going to cut one of the cars off, but backed off. They need to be more careful, especially in a company truck. After the semi truck, they then proceeded to go as slow as the cars, like there was no point in trying that.