ok i noticed this weekend that my front driverside tire is making a humming sound like there is something in the tire. after ferther revew i noticed both my front tires are starting to wear funny. the tread is poping up and the sides of the tires are not even touching the ground. the air pressure is the same as the back ones and it us under the max psi so the over inflated question is out (so i think). i thought maybe the ball joints were going bad but the truck only has 26,000 miles on it plus it drives strait as an arrow, doesnt pull at all. what do you guys think could be the problem. i rotated the front tires to the back and i want to see if these tires do the same thing. i hope its the tires and not the front end. any sugestions guys?