Hi all,
I'm chasing a vibration in mine also (TTG), which has been there to some extent it's whole life. I got my Territory with about 40k on the clock, now has 150k.
The vibration I have is noticeable more at particular speeds (50-60km/h) but somewhat at all times ( can feel it through the car as a whole, not just the steering and can see in in the rear seats and rear view mirror) the main cause seems to be the rear tailshaft as the vibration is visible (at the centre bearing) when run up to speed in the air. There may also be other vibrations from other area's, but until I sort the rear shaft I won't know.
I'll try to update on how it goes with the tailshaft sorted and what ends up being involved.
Cheers Brent.