But a huge percentage of them are pretty terrible, and yeah, I've definitely noticed quite a few are Silverado / F150 specifically.
Some are speed demons, but most are of the more annoying slow driver variety. Where they drive the speed limit or 5-10 under it, even when traffic usually would go 10 over it. And if you try to pass them, they'll speed up to try and stop it (super fucking dangerous and vile to do), and failing that, speed up to ride your ass afterwards.
One even tried to follow me home once, but I just drove in circles until he left. That was pretty unnerving.