Sorry for the error, should be 1.5 inch outside tubing.
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I used 1.5 inch i.d. aluminum tubing with 1/4 inch wall to create 1 X 1 inch inch inside. I've inserted these 1 inch cubes everywhere my bolts go through to add internal support.
Mine isn't a cam over, just hangs so I haven't had a problem with pulling away and I have quite a bit of tension on the platform hinge to eliminate tip ups. I've thought about amsteel rope from the front of the platform down around the tree grip if I do have a problem.Mine cams best when the cam buckle strap is level around the tree. Then put a very small amount of slack in the strap and cam it over. Play with the tension of the strap to get the rock solid cam over. Hope this helps.