Stress Testing a Tube?

I have an Ultralight/Light Sport Aircraft, about 340lbs. I have a 350lb Load. I have two landing gear Tubes 1.0" - 16" 4130 .065" mounted at 45 degrees. Is there a way to Stress Test them in CAD? I'm wondering if I should go to .083" 4130 Tube? Also, if I filled the inside of the Tubes with 2 part epoxy plastic, would I benift?

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