I own a 2016 GMC Sierra 1500 SLE Crew Cab 5.3L z71 with p265/65/18. No vibration when I initially bought vehicle new. @20k miles I took vehicle to dealership for oil change and they found nail in rear driver side tire and offered to patch tire. After they patched tire there was vibration at 75mph. Took it back to dealer and they said it would be $49 to balance tire. Told them to forget it, I'll try to stay below 75 and wait until I get some new tires. @27k miles I still had the vibration at 75 mph until I took it to dealer again for oil change and tire rotation. Vibration is now gone. Seems the rear is more sensitive with proper balanced tires then the front.
Hope this helps somebody.
