The truck belongs to Mr. You-Are-Portuguese, and I spent the remainder of the run watching for people on the trail that looked 1. Male and 2. 60-ish. Younger males, females, families, bicyclists, runners, and other people who did not match Mr. You-Are-Portuguese's build were ignored and passed on the trail as per usual.
I did actually see him, but I was prepared. I turned around and ran in the opposite direction, then went back and forth between the trailhead and Mum and Darcy. No one has time to put up with that guy, especially not when the humidity is as high as it was today and when tiny gnats are hovering in clouds at eye-level everywhere.
I ate a gnat. It was not on purpose.
Photographic evidence of Mr. You-Are-Portuguese's truck, so you guys don't think I'm making this up. I wish I were making this up: