Have yuo had the rims checked for being bent? There is a balancer on the market it is a Hunter GSP9700 It will find problems with wheel and tires and tell you where to mount the tire on the rim for the least amount of vibration. It will also tell you where to put the tire/wheel assy on the vehicle to get the least amount of vibration and pull. You can go to
http://www.gsp9700.com/ to learn more and to find someone in your area that has it. I have fixed numerous vehicles for vibrations that other shops could not find with this machine.
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