I have a 2009 Limited, V6, ~ 74K miles. A little more than a year ago I had the brakes redone after market pads and rotors all around and a month later I changed the tires from Michielen Cross terrain tires to Firestone Destination LE2s. Not too long after this time as a maintenance check I had the fluids checked in the transfer cases and the differentials and everything checked out and the fluids looked like new. I also had the joints greased. After several months of running starting in early November I noticed and increase in road noise starting at 25 - 30 mph ? Could this just be tires ? I just had the oil changed and the tires rotated and they said everything looked fine and sounded good. Even tire wear all around so no alignment issues. Could the tires just be collecting stuff from the winter road treatments? I didn't notice this type of road noise with the Michelin tires I had with a lot of miles on them. If you turn up the radio the noise is not to noticeable.