I do not know, but, if the military had input on the specs, I am sure they are not made for comfort. that means, it probably is not a soft rubber compound like the goodyear wranglers i have on my 79. I used to have bf goodrich all-terrains. the all-terrains by goodrich is a very hard compound, therefore, tire wear is good--however, it will slack in performance, hard turns and such. I bet the hummer tires are like that.
I love my goodyear wranglers--i wont get 50k miles out of them like the goodrich, but the handling is smooth and sharp.
SgtDel
aka "Andy"
www.delbridge.net
1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4