25 comprising rear wall sub assembly 29 and wall to suspension reinforcement system 50 shown further is a section through the lower right corner of rear wall system 25 and right hand wall side assembly 22 comprising an inner skin 28 an insulating spacer 29 and an outer skin 60 the material type and thickness of inner skin 28 and outer skin 60 the material and width of insulating spacer 29 is defined by load management requirements for frameless vehicle 10 bending and shear strength of sub assembly as example with due considerations for design limits imposed by material availability standard sheet stock thickness as example and manufacturing processes encapsulation molding as example materials used for inner skin 28 outer skin 60 could be conceived as aluminum plastics or composites cut sheet stock or press formed using common manufacturing processes sheet metal pressing as example similarity insulating spacer 29 could be conceived as polymers or paper urethane foam as example utilizing common manufacturing processes injection molding as example wall load system 20 comprising left hand wall assembly 21 and right had wall assembly 22 all sub assemblies 26 upper wall assembly 23 comprising upper wall sub assemblies 27 middle wall assembly 24 comprising middle wall sub assemblies.