Not a camera question.
Do you really want to advertise to the world, on the back of your car that you may be carrying expensive Canon equipment inside?
Exactly. Not something I'd do. Besides why give a company free advertising? It's bad enough they plaster their logo on everything they sell.
My thoughts too. I rather prefer this one: http://www.ebay.com/itm/Protected-Smith-Wesson-vinyl-window-sticker-decal-sign-/190619985311#ht_500wt_665
The house of a friend of mine was broken into one day while he was at work, so he put that S&W sticker on the back door only to have the thief return another day, find where my friend kept his gun hidden, and steal that! Thieves find such decals far more useful than intimidating. Better to put an alarm company decal on your house and car.
My online photo galleries