NJAV,
Not really concerned about it coming off. Just like the location there better. I already have two stickers on my back glass, a red "22" on the lower-left and a Cat Racing sticker on the lower-right - I'm a Ward Burton NASCAR fan.
Plus the visibility there is pretty poor if you are trying to attract anyone to the text. They'd darn near have to climb onto the truck in order to read anything I'm guessing.
So then, are you saying the cladding would be a bad place for the decal as far as adhesion?
Jamie