[maxwedge]

I think each car design may have built in long term weaknesses, type of driving conditions of course enter the picture, rust naturally, my race car, before installing a full cage back then, showed fatigue in the torque boxes just behind the k member, even got a kink over the drivers door. Granted with the Hemi in it for 100 runs I was asking for trouble, that of course is the extreme example. Most unibodies seem to have pretty good floor bracing, a convertible is asking for trouble if not designed properly.