wildmanbaker wrote:
What you have described, is axle shift, under the frame. Get a bar, at least 18" long and pry on the pan hard bar to check the mounding bolts and the bushings. There should some loose parts under the rear to cause this. Check the bushings on the control arms the support the bottom of the air bags also.
I am going to take it into a truck alignment shop tomorrow morning along with a summary of these posts. I also intend to get it weighed as well just to be sure. If all this produces nothing, I am going to be taking a hard look at those tires, despite my faith in Toyo.