So lately I've noticed that my front tires have started to wear funny on the inside part of the tread. (Cupping) Mostly on the left inside. I'm not sure, but could this be due to bad shocks, or front end alignment, or?? Seems to shake just a little bit on the freeway around 60 MPH. I have about 30,000 miles on the tires (BFG AT's & I rotate them every 5000 miles & still a lot of tread left). I have no lift, & 70,000 miles on the factory shocks. I've wheeled maybe a few times a year, (had it 4 years now) basic 4X4ing, nothing real serious, but I have driven out in Death Valley for a few hundred miles, & that takes a toll on shocks I know. Should I replace the shocks first before anything else? I would like to keep it stock, at least till I pay off this thing. (Few more years) I'm thinking about getting Bilstiens all around, but not sure which ones to get?? Thoughts??