Well, I've never seen it. Being from San Francisco, I am used to seeing, shall we say, alternative attractions. This has been one of my longer trips taken on heavily trucked two lane roads. I realize I have automatically developed a safety habit to adjust. These roads are posted at 65 or 70.
Trucks do that uphill.
The approaching trucks throw such a blast wave of air that my ears actually hurt from the pressure if I am too close. So I found myself doing the 'truck weave'. As trucks approach, I drift to the far right of the lane, then swoop into the vortex as the truck passes. I don't remember this being taught in the Motorcycle Safety Foundation classes, but it should. Lots of Indian country today, various Sioux nations.