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I switched from using square channel tubing to the round tubing on roller doors a few years ago, using the measurements offered by the manufacturer to determine distance between supports. I have been extremely pleased. I even used them in the new box stalls because they slide so much better than the square tubing. The roller balls are made of neoprene or some such, rather than steel and they roll better longer. More importantly, if the wind or anything catches a door and it flips up, even a foot or two, those roller balls are designed to move, rather than the square channel twisting. I know you didn't ask this question specifically, but once you have moved these doors one time with the round tube method, you'll never go back. I got the idea from a big commercial farm nearby with plenty of large shed doors. They told me they would never go back. I used 2x6's everywhere, top, sides and middle, with notched joints and metal splicers, so that I would only have to build it once, unlike my first efforts with 2x4s that would come apart over the years. With the round system, the weight is not an issue. Good luck.
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