There was a good list of 85 things not to do, or you'll be a terrorism suspect. The link I'd had is dead now, but I was able to find this one, which only has 71 things on its list of 85 items:
You May Already Be an FBI Terror Suspect: 85 Things Not to Do
Communities Against Terrorism enlists everyday busybodies to spy on us.
They don't list taking a picture of your own truck, so I'm sure we tipped some of the other items here.