Steering Wheel Vibrate problems of the 2013 Toyota Tacoma

Vehicle problem since new, steering wheel shake at speeds between 45-75mph. Took to dealer stated that they new of the problem and there was nothing they can do. Tech drove the vehicle and stated that he felt nothing when the shimmy was quit obvious (I was sitting next to him). Have taken to other local shops and they are unable to remedy the shake. Shake causes passenger seat to shake as well truck bed to hop. Toyota of America is well aware of this problem and has shown no effort to remedy the problem. Many cases documented on Toyota forums and blogs. Toyota has had to deal with arbitration from many consumers and all cases have been turned down. A major investigation on this problem needs to be done. Owners of the Tacoma, 4runner and tundra have had the issue.