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coolbeans. I downloaded it. will wander thru it this week. Thanks a bunch for the quick link.

So I'll just start with this. Where should I go read up on how to know the weight limit of a given thickness of a steel square or rectangular tube? Say for example for simplifying this visually. a tow trucks center beam that is pushed up by a cylinder(s)? Typically they are 8 - 10 feet long i...