Any good software out there for designing and testing steel racking?

i need to build a 3 shelf rack that will hold about 1500lbs per shelf
overall 100"x24"

I would like to have it all open except for the side frames. there will
be a load of 750 lbs on the right and 75lbs on the left of each shelf...
any ideas?


was thinking 2"x2" .110 for the frames and 2x4 for the beams .110