I have a problem with my recent purchase of Goodyear MTRs in size 285/75R16. My X shakes to death at speeds above 60mph (on the speedo). Everyint else on my truck is stock with the exception of these tires and some cosmetic stuff like roof rack, rock sliders, etc. (basically no suspension mods). I've had the tires re-balanced 2 times with no luck. Can anyone help me fix this? The shakes at highway speeds is totally ruining the ride.