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Virginia | A chart which would be used to size girders for pole buildings should get you in the ball park. The biggest difference I see would be from the load moving or bouncing when traveling vs a snow load on the roof. Convert the load on the wagon to a roof load for the same length girder and add a safety factor and see what you get.
I know someone on here will pick this idea to death, lol.
If you don't have any charts I can get my hands on some I think.
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Lumber strength
