Common problems to look for.....

[Longhorn]

I have an 03 and have had some issues with Hippies and Econuts which is generally not covered by the factory warranty.

I would definitely check the undercarriage to see if you have a Hippie infestation. They have been known to "nest" in and around Hummers in protest. (especially here in Austin)

Look/smell/listen for rolling papers, patchoulli and The Greatful Dead.

College know it all Hippies are the worst. . .