Wow!! My '06 has a SMALL spec that I plan on fixing below the weather stripping below the rear window. And of course, it has the small spec under the chrome molding that is very common. When it warms up, I plan on pulling the chrome piece, painting it, and taking care of the rust at the same time. My case is so minor you can't see it unless you look for it.
How often do you wash your truck?