mnswamp wrote: Timbren strongly recommends .125 as a minimum... I could probably mickey mouse doubler plates over the attachment, under the attachment, and squish tubes inside the tubes, but at this point I think it's back to 2x2x.125 for the frame.
~marsh
Its easy to add thickness where you want it, the added weight of going thicker and with more flex I dont like. Do the side frame rails out of 2x3 .120 if you the extra thickness, no need to do the whole thing with with it.
But personally I would just weld on some plates where the axles goes.