sorry, not much help
my 04 s/c Lb has a slight issue with the prop shaft causing a vibration but that is when the truck is moving. my windows tend to be "lose" and if down 1/2 inch they rattle against the guides, and i just found out that i had a lazy caliper on the driver side which killed a set of pads and was pulling my truck to left...
where does it vibrate? any specific area? could it just be a loose panel/or wheel well? fender flares?
if it is used you might want to check the history of it to make sure it wasn't in an accident. i have seen, although avoided and not purchased, cars that dealers have repaired and tried to sell.
check for matching colors on front wheel wells to mae sure not front end damage happened. i opened trunk to one car and it had different paint schemes. that tipped me off that something was not exactly right.
think, we all need a little more specific info to help you out. where is rattle/vibration? in front, under seats, can feel at steeringwheel?, may be on a ss end?
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