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Compared to a C5x6.7, the 5x2x3/16 tube will give you about double the uniform load capacity and only weighs about 25% more. This substitution would only add about 90lbs to the frame. The problem will be that you will not be able to use the perforated cross members since they will be too long and not configured to be shortened that much. Substituting a 12ga bent plate will add quite a bit of weight to the frame.
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