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I had a Crew Cab K-3500 ( GMC ) that flexed WAAAAY to much when crossing ruts while off road...
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I get some wild frame flex on my crewcab as well. However, my loggers' box is so rigid it pulled the front box mounts apart /forums/images/graemlins/eek.gif (still held on by middle & rear) On the bright side, that prevents the cab from getting galled by the box and headache rack. /forums/images/graemlins/thumb.gif
Maybe guys with pickup boxes could benefit from undoing the front box mounts /forums/images/graemlins/dunno.gif