Porter is correct, I got a set of the dot compound 37"s awhile back to test out and put them on the wifes YJ. They have very stiff sidewalls (ran them at about 3psi) to get them to bulge, and they flat out hooked up on anything. Dry rocks, roots, mud (not a big mud fan so just trail mud) wet rocks were no problem where comparable tires that day did not work as well (MT/R, Irock, TSL, Krawlers).
They impressed a few die hard TSL fans to the point they are looking at getting them.
I will definetly run them on upcoming rigs, and looking at them for the stock mod rig.