you can do a search for Pro Comp Extreme allterrain, not to be confused with another tire made by procomp called xtreme _____? I bought my tires from a site called
http://www.wheelsandspinners.com but they dont really have much info on the tires unless you call them directly. This tire is fairly new to the market so there is not alot of information on the web yet. I will tell you another pretty good looking a/t and its the mickey thompsaon atz. It comes in a 35x13.50-20 as well. I think the next size up is a 36x15.50 which i think would be too wide for a non lifted truck(buti could be wrong).