Driveshaft problems of the 2005 Lexus LS

I own a 2005 Lexus gx470 with 10,000 miles. We have experienced the Toyota/Lexus "bump/stop" whiplash simulation on a daily basis. Lexus/Toyota had been replacing drive shafts on many vehicles which "jump forward" for no reason. Lexus is now saying that this dangerous condition is a "normal design function" of the vehicle. I spoke with tom norton, one of the owners of Lexus of cherry hill, NJ today. He told me that his gx470 does the same thing that my $50,000 vehicle does. Mr. Norton did agree that Lexus had replaced multiple driveshafts in the past & that this condition is absolutely not normal. However, he, & I'm now using my own words, must hold the company line, & tell customers what they're being instructed from Lexus headquarters. As a police supervisor, I drive for a living. I've never experienced a vehicle "jumping forward" as I have on my Lexus gx470. Should this problem not be corrected, I will sue under lemon law. I will write my legislators. I will write editorials to every newspaper in the region. I will picket dealerships on my days off. Should NHTSA and/or Lexus/Toyota neglect immediate attention to this matter, I will share my experience with investigative reporters. Why should my 4 year old have to sit in a vehicle that is unsafe? why should my wife have to cry in a service department because her pleas for assistance go completely unanswered? why should a cocky service manager call my cell phone to explain to me that I don't know what I'm talking about? Toyota now contemplates buying the failing gm as Toyota fears possible american consumer & governmental backlash. If you have to recall vehicles, so be it. As 60 minutes' andy rooney would say, ". . . It doesn't take a rocket scientist to know there's a problem here. . . " ladies & gentlemen, there's a problem here. We've paid top dollar for what are billed as superior vehicles. Live up to your reputation & fix the problem.