Does anyone have CAD program

Use google sketch up, what are you looking to use the program for? are you looking for something to tell you if it's strong enough?
 
You're looking for some pretty specialist programs, many CAD programs wont have that ability, I work with steel for a living, tell me about the stand and the tank you're putting on it and I'll tell you where you'll need support.
 
CAD (Computer-aided Design) is a drawing tool that is not meant to calculate stresses. Calculating the stress the stand will experience is a deformable bodies/loading beam/structural design problem. It will involve the strength of steel you are using (thickness, etc.). I'm sure there are materials/threads out there to point you in the right direction on how to design a steel stand.
 
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