Quote:
Originally Posted by aerohead
Both,longitudinally,and transversely,the unibody would have orders of magnitude larger structural triangulation and stiffness available,compared with a body-on-frame, stamped- steel chassis.And with less mass.The roof apex would act as an integral rollbar,augmenting a-pillars,b-pillars,and c-pillars in tightening,roll-over roof-crush protection standards.I don't know how you could beat it for beaming and torsional rigidity.
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You actually want the frame to twist while carrying loads over rough ground. The ladder frame acts as a large torsional spring independent from body and bed.
With a unibody those forces go into the unibody stressing all the spot welds that hold it together. Eventually they fatigue and fail.