I had this same problem with my last set of M/T. I actually did a little research and found a way to cut down significantly on the tire noise. Take the tires off one at a time and set it up on a table. once on the table, get a heat gun and go around the tires and warm the treads up as much as possible. once the rubber reaches about 88-90 degrees, it becomes pliable enough to manipulate the profile to reduce the sound attenuation and resonance that you hear in the cab. With the rubber still warm, take some glitter and spread it evenly between the treads as you spin the tire. take the heat gun and go back over the glitter to make sure it sets in grooves. once you've sufficiently covered the tire, smack it 3-4 times with a rubber mallet. after that, put em back on and you'll be good to go. you're welcome!