Quote:
Originally Posted by sphelps
Personally I would still suggest going 2" for the amount of weight. If you do use 1-1/2 then be sure it is actually HSS (structural steel, cold forged). If it's just hot rolled square tubing 1-1/2 is going to be pretty sketchy. As others have suggested extra columns is a good idea as well as adding angled supports at all corners to reduce the load on the joints and keep things square.
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Good point almost all tubing 1.5 or smaller isn't tested for yield and tensile with the exception Griz mentioned 188 wall. Personally I would worry more about the guy doing the fabricating. You could get the best materials but if the guy doing the work doesn't know what he's doing it could be a disaster