Over the last 3 weeks I've noticed off and on a rattle/vibration when driving at highway speeds. I've checked the various cubbies and can't find anything that could be the cause. Has anyone else experienced this?

I can only hear it if I turn the music completely off and no one speaks. As I said earlier, it's a combination of a slight rattle combined with a vibration.

I drive most of the time with the cruise on so its not being affected by acceleration or deceleration for that matter. Has it always been there and I'm just noticing it? Thoughts?

 

Went to a body shop and one of their guys say that the middle row DVD/Screen is the source of the rattle. He recommended that we go to an out of town Chevrolet dealer and have them pull the roof liner out to find whatever it is that is loose.

 

Circling back. Problem solved. Turns out the problem was the cross bars on the top of the truck. They had gotten loose and that was causing the rattle. The dealer tightened them up and the truck sounds like its brand new!