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

Thanks! C

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Just what I needed, thanks. C

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