I looked at the bulliten and appreciate you posting it. I do not see where it is specific to 18" wheels? I have this issue at times with aftermarket wheels that I carefully balanced myself. Reading the remedy in the TSIB it would seem it could apply regardless of the wheels used. Any input on that?
I had my car in for this, after they performed the procedure there was still a vibration so they checked the tires for balance. Well apparently the two back tires were out of balance. Dealership took care of it.