So oem tires at 30k miles, some would say that is all the are really good for? What say you to the cause of this? Two back tires bald in center, 2 front tires still like new. No I didn't rotate, I always planned on getting new tires just didnt care like I should have, but admittedly took too long to do it. Now they are worthless on craigslist, I will keep them for spares or yard art. I always thought it was freeway driving with tailgate up putting downforce on them. The book says over inflation, but I never was above 35psi like ever! You have to be at 35psi to clear the TPMS so how could that be it? Could be alignment maybe? Interesting, my tire guy said it was the shocks, mind you the shocks only have 30k miles on them as well. He said he could tell by the way the wear was bumpy, and he has been doing this for 8 years, I think it is possible, but I think the tailgate is to blame, hard to say, convince me your opinion. I put new shocks on front pretty soon after buying the truck, but never did backs, something I will be changing. I think kyb for backs, bills up front.