BFG long trails are pretty good tires. if you havent already go to a discount/ americas tire co. ( if you live in dallas there should be one on almost every corner). ask them to use road force on your tires and they can also check your rim run out to see if its out of round or bent anywhere. road forcing also shows you where the heavy spot on your tire is, as well as your wheel. an acceptable amount for truck/ SUV tires is up to 31 lbs. if its anywhere over that the machine will tell you where to mark the tire and wheel. you break down the tire and line up the marks and try rebalancing them. most of the time this will get rid of some of the vibration. but like i said earlier if your wheels are static balanced ( it sounds like they are) then you wont have as good of a balance no matter what.