[theastronaut]

Keith, I don't disagree with anything you posted but I wonder how much of it is applicable? You're talking about big trucks made to carry large amounts of weight. Also, were the frames on the old Chevy trucks heat treated, or just stamped from plain steel? The rails sure do drill through easily enough, I can't imagine them being hardened in any way. I'm after bracing the frame to resist torsional twisting, not to handle high towing weight. I would think that different types of bracing are needed for the two different applications? Again, not disagreeing with anything you posted, just wondering how much of that works to resist torsional flexing.
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