Need Box Steel Specs for Boat Support - SailNet Community

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Old 10-07-2013
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Need Box Steel Specs for Boat Support

Hello everyone. I have 3 X 3 X 3/16"' box mild steel and I want to store
my boat on crossbeams supported only on the ends. I have enough steel that I could double the beams by welding.

I was wondering if anyone could tell me the dead load capacity of this steel.
For a good ball park idea of span I haven't figured it out yet, but it will be anywhere up to 140 inches across or less to allow the trailer to pull out and leave the boat on jack stands.

Thanks.
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