I found this interesting, dangerous convoys compilation video on YouTube. The title implies that its nuclear weapons and waste but some of the shipments look nothing like that. That being said, the giant black tube in the thumbnail does kinda look like a very large missile tube. Who knows though. Some of the convoys are protected more than others. The one I find the most interesting is the one that has multiple military helicopters, many cop cars, and numerous armored cars escorting it. That particular convoy shows up multiple times in the video. Super cool stuff either way.
Check out the dangerous convoys video below.