CAR/BUS BODIES, truck cabs or truck/trailer frames in their mathematical representation are considered as shell-type or combined shell-and-beam type structures. Vlasov's Theory of Thin-Walled Beams turns out to be a fruitful means of analyzing these structures for strength and cost effectiveness. The use of this theory in the finite element method and in overall vehicle structural analyses is shown. With the application of this theory, these analyses become more comprehensive and explicit. Typical vehicle structures are analyzed. Critical load/stress areas are identified and evaluated.