CNC, IIRC is something like "computerized numerical control," and means that the computer is doing the actuating of machine work rather than either a person or an automated type of feed without feedback.
I was just reading that magnum size of earthmover tires, e.g., are hand laid into molds, such that a factory can produce only a few tires a day or less. Hand layup has got to be less accurate, hence my theory that if truck tires are not CNC tolerance in the manufacture that random internal weaknesses could be more prevalent than in passenger tires, and that they may progress over time.
BTW, Tom, what do you look for in R&R'ing a tire after a pothole soiree? Do you find pinch marks, ruptured interior skin, etc.?
Baja-tested '08 2-slide 36'
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