anything from loose lugs, to spindle separation to bearing failure All that can be seen is the video is that his wheels are almost as wide as HD tow mirrors. Id10t may have hit a curb, pothole, or any number of other things that started the failure process, but having the wheels that far out with that much leverage on parts shure as he!! finished the day for him and the poor unsuspecting driver in the other vehicle.
If you slow down the video by pause/play/pause then you can see the brake rotor is still attached to the wheel, so a bearing/spindle failure would be my best guess. Ya'all hold ma beer and watch this. Aint I kool?
Here is another one. If you watch enough of this video you will see the rear wheel with spacer attaches, and a little further on the truck with the rear wheel missing, and the studs still intact. Appears to be that the driver never checked and or retorqued the spacer lugs. They should be checked periodically just like trailer alloy wheels.
I'll just stick with shat came on the truck, thank you very much.