my heavy truck experience is not very much, have done alot of repair work on IH tractor trailers and dumps but i have never ever heard of an aluminum frame on anything but a sportscar, was this very common, what was the reason just lower weight, were these full gvw tractors that had aluminum frames or just lighter duty ones, i have seen what happens to steel frames over time so i can only imagine that an aluminum frame must have to be 4 times as thick to even hope to stand up
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