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It makes all the sense in the world to a structural guy.
The Corvette has a completely different structural arrangement from the Camaro - it's a body on a separate frame, where the metal frame provides virtually all of the chassis strength and stiffness.
Camaros, Mustangs, Challengers, and virtually all other current cars are of unibody designs that count heavily on the roof structure for meeting chassis structural requirements. Convertibles on those chassis typically have additional bracing underneath to try to make up for come of that "loss" (and weigh a bit more overall partly because of this).
Norm
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