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The site was correct about the ply ratings. As for pressure, realize that these tires get used on a variety of different vehicles from 1/2 tons on up and one needs to realize that they need to use an appropriate pressure in their tires for their purpose. Tires normally have the "max. pres." on the tire carcass, so do not confuse that number as the press. that you should be using. I run my rears at max. press. when pulling my 38ft. dry van loaded up and the fronts at about 80% of that rating. When not towing, I drop those numbers significantly, depending on the season.
I know that's not a diffinative answer, but it should allow you to have an idea as to how to judge your tires and what you want to accomplish with them. Just remember to pick the tire design that meets your objective and keep an eye out on the tread wear and make adjustments to your pressures if there are unusual wear patterns, then make the press. adjustments. If the ride is too harsh and all other factors are normal, then let some air out to a lower press and see if that helps and doesn't affect the tires. Experience will build and you'll begin to know what tires and press. works best for your set of circumstances. I had to learn on my dually as I never owned one until this 99 PS. I went through two sets until I settled on straight treads on the front and A/T's on the back for drivers. After towing for a couple of years I was able to tune in the pressures when towing. Again, experience.
Hope this helps and I should point out, this is just one persons experience and view.