Yeah, I'd say aero stability is a factor at street legal speeds. Drive an old Microbus in some stout gusty Midwest crosswinds, throw in some passing semi's too and you'll agree. Then put some ballast near the front, to get the Cp aft of the Cg (think of shooting an arrow backwards) and like waving a magic wand, the 'Bus settles right down! In the case of Microbusses that occurs at SUB-legal speeds!
