Goodyear posts that in "selected sizes" they add the nylon cap. In all the sizes I have had to deal with I've not seen one with the nylon.Do you use the actual load rating limits if you are using LT tires?
What you are seeing on the shoulder on that tire is the ply. The main problem with ST tires are none of them have the "nylon cap" that every other tire on the road uses now post "Firestone Fiasco". That cap keeps the belts from separating.