This is a new 2008 extended cab 4x4 gmc canyon. the doors rattle all the because the rear doors are not mounted to the frame but only to the skin of the vehicle. this means there is constant flexing and vibrating between the two doors and the door frame. this vehicle has been to the dealer 4 times in the month i've owned it and they say "that's just the way it is". there is also an intermittent knock in the rt front of the vehicle that the dealer can't find. finally the drivers side seat material is having to be replaced because of wear and stretching and this vehicle only has 500 miles on it. *tr