That's no bull Bill.
If you change the diameter of the tires the speedometer will be off
requiring recalibration. And if you go to big in diameter or to wide you
will rub the chassis when turning the wheels all the way left or right.
Additionally, if you have a duramax with Allison auto ( 04.5 LLY and up )..
if you go to larger tires, the dealer cannot recalibrate for the error.
GM's policy is only OEM tire sizes on that combo. And the tech2 is blocked
from changing that parameter on those trucks. GM has a TSB on it.
You can still run the tires, just the speedo/trip meter and ABS cal will be
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