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This year is the first that we're going to use the Bosch extrusion. In the past, we've used .5" square Al tubing, and it has held up fairly well. We only ever got dented once, but even then, the tubing survived much better than the .25" plate that got hit.
Therefore, we decided to stick with the 20x20 (approx .75") since we figured 30x30 (approx 1 1/8") is overkill. We have no idea how it's going to turn out, but we're hoping for the best.
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