Is this going to hold

[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.

[jorjef]

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.

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