My truck has the 20" wheels, when I first got it there was a slight vibe at the 41-49 mph, bitched about the Goodyears and dealer put on Bridgestone ATs. Rode pretty good for awhile, then one day got a hell of a vibration at 75. Took the truck to a Bridgestone dealer, they road forced the tires and rotated. All was good after that with only a slight vibe at 41-49 once in awhile, which I could live with. Few weeks ago had dealer do service , they rotated the tires and bingo, back to vibrations at both low and high speed. They have balanced the tires few times, nothing but a hassle. Been seriously considering buying 18" rims and a set of Cooper ATPs ..also been looking at different brand of trucks too.