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I found some 1-1/4" steel square tube at the local tractor store. It fits in the hitch receiver just right. I have 48" but will cut it down.
I plan to use angle iron bolted to the tube to fasten a plywood base. I may take the cutoff piece of tube and weld it to the end to make a tee, to improve stiffness.
I would have preferred aluminum square tube to reduce weight but the steel was only $10 and there was no aluminum in 1-1/4". Its not that heavy. I think I am pretty lucky to have found the steel so easily, just happened to walk by it while buying some other stuff.
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