We got to within 2 miles of a trailhead but the forest service road was blocked by a pickup. The road is barely wide enough for 1 vehicle, with a cliff on one side and a drop off on the other. Our choices were to back down to a place where we could park safely (approximately another 3 miles down) which would give us a 5 mile hike just to the trailhead, or declare the trip derailed.
There was no note on the truck, only a few scattered price tags from clothing and gear in the truck bed.
After hiking up to the trailhead (where there is plenty of parking and no one was there), there were no new cards filled out so we had no idea how long the person planned to be up there.
We backed all the way down the mountain, took another forest service road and took a different trail.
I took a picture of the truck and plate and called it in when we got back. I have no idea why he left his truck where he did but there were no reports later of missing hikers or abandoned vehicles.
Probably just a real tool.