Went for something silly and different. Stuck a camera on a suction grip on the hood of the truck with a lighting trigger and a remote wireless shutter. Set it up, stopped down heavily to get a slow shutter speed to get some blur on the passing trees and all, but just enough to keep the truck sharp, and I exposed myself with a flash that triggered with the camera (flash duration becomes exposure duration). I used a CPL to kill the reflections off the glass. Took a few shots to get something that looked kind of like what I was going for. Live and learn.