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Stay away from the square tubing it is not nearly as strong as round. All of my cages were made of 1 3/4" OD x .088 wall DOM. For peripheral structures I use .060 wall where driver safety is not in question. For the extreme front and rear bumpers use 1 1/2" dia .065 to create a crush zone.
The key is you must use DOM tubing. Regular tubing will split at the weld seam.