Which is stronger 3x3 .25 inch thick square tubing or 4x2 .125 inch thick square tubing? When positioned vertically about 40inches high (considering that when positioned vertically it is completely secured), and a 20 inch square tubing attached at different levels between the 40 inches (either 3x3 or 4x2 tubing), at any levels of the 40 inch tube can it handle at least 1000lbs? (specially at the top) In other word: Forming like an upside down "L" shape being 40 inches vertically (with either 3x3 0.25thick or 4x2 0.125thick square tubing) and 20 inches horizontally (considering that this part is strong enough). Will this be strong enough to hand at least 1000lbs? OR should I angle the L shape instead of being 90 degrees possibly 95 degrees. At maximum I wouldn't want the angle to be more than 100.12 degrees. But overall I would prefer to not add any angle at all. I was looking at this link for some help but I think I need more help. https://www.physicsforums.com/showthread.php?t=351727 If none of them will handle it please add suggestions. Please let me know if any of this is unclear.