Third. If you live in California, the LWB gets into a nasty harmonic with the seams of some concrete roads. I think what is happening is that the front tire is in the middle of the concrete slab (which is a low point) and the rear tire is on the seam (which is a high point) and that alternates low to high as you drive along. I've found that if I go closer to 80mph that it lessens. but I don't like driving that fast so I just deal with it. The same thing happened with my extended cab Dodge 1500. Interstate 8 in San Diego, portions of the 405 in Orange and LA counties and examples. There was also a guy who lived in Arizona that seemed to have the same issue. So there may be other areas with this same issue.
