Strength of tubing?

Can anyone tell me the safe working load and/or failure point of some
rectangular tubing, or point me to a web page? Both sticks sit on the
2" face. It is for a utility trailer.
2"x4"x0.120" at 144" long, anchored in the middle, how much weight at
the ends.
2"x3"x0.120" at 72" anchored at the ends
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A pretty good site that has beam bending calculators as well as the section properties calculators is
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You need to include factor of safety of at least 4. (Over design so that the maximum stress in the outer fibers of the beam is 1/4 or less of the tensile strength of the material the beam is made of .
CROQ wrote:
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Just what I needed, thanks. C
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