Always been a fan of the BFG All Terrains, have them on all my trucks, and with the recent purchase of our Yukon, I threw on a set of the new KO2's. The new look is pretty aggressive from a sidewall view compared to the first generations, but over all they were great. I went with the factory size 275/55r20, however learned I had to trim a bit of the fender well liner due to rubbing at full lock on the passenger side. The contact is wider than the factory bridgestone duelers, so hence the rubbing. Haven't put many miles on them yet since the truck went back to the dealer for some electrical issues. But if they're supposed to be better than the first generations, I know I won't have any problems with them.
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