I like vinyl stickers like that, but I'd more more apt to put something with some more 'pizazz' on my vehicles. (Color, a logo, both, etc.)
For example, I have this Omer sticker on my truck (only it says "Breathless Emotions" instead of "Authorized Dealer"). Only the letters are on the truck, in vinyl.
Sorry that picture is huge, I just googled "OMER" and grabbed a picture off of the internet since I'm no where near my truck or a camera...