When I see a big, dual cab pickup, that is really shiny and looks like it's never been driven off road in the last 3 years, I usually assume the driver is a self-centered jerk. I know that's not universal, but I've found it to be the case too many times.
Most recently, giant truck in the drive-thru at Culvers refused to pull forward into the center of the "waiting spot" so that he could pull around the guy in front of him on the chance his order came out first. In the process, his very long vehicle made it so that I could barely pull up to the window, and then was unable to pull away because I could not get around him. Heaven forbid he may have to wait an extra 60 seconds!