Abstract: A frame for a vehicle chassis includes C-cross section side rails and interconnecting cross members which extend through the vertical webs of the side rails and are attached with connecting brackets to the outside faces thereof. This construction provides the capability of utilizing extended length cross members to which other vehicle components, such as fuel tanks, suspension members, fenders and the like, may be attached.

Abstract: A vehicle frame component, such as a siderail or a cross member, is formed with a generally C-shaped cross section in which the vertical web member has a greatly reduced mass, as compared to a comparable C-channel section of uniform construction. The reduced mass web member has a corresponding reduced effective cross section to substantially reduce the component weight without adversely affecting its vertical stiffness.