Strength of various HRS and Equal Angle Sections

John, John - I fear you are attempting to "over-engineer" your trailer project. The working loads imposed on a highway trailer are more complex than the "relative load bearing characteristics" you seek. Simply stated, it is impossible to anticipate in advance what the actual working loads will be -- think of rough roads, sudden braking stops, overloads, joint design etc and even if you are a skilled structural engineer, you will eventually have to pull some of the unknowns out of the air. I suggest that you examine an existing unit that has proven satisfactory under similar loading, and use that for a preliminary design. Safety should be an important consideration, and thus an overdesign makes good sense. The cost of a failure would be far higher than any savings from a cheap design. Cheers, Dave

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