You're likely to not get an answer to your question because you're asking someone to engineer a load bearing weldment that will be subjected to some nasty vibration and shock loads, as well as having a probable finite cycle life. If someone did suggest a tube size, they have no control over (no offense meant here) the quality of the welds nor the overall design.
If it failed, no matter the failure mode, the person that gave you advice could, in reality, be held partially at fault for the failure and any resulting property damage or even loss of life. As a matter of fact, I would urge anyone to avoid answering this question, or questions like it unless they have the proper insurance coverage for the situation.
Sorry dude...blame the lawyers.
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