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Neal,
We successfully uses BOSCH 30x30 last year with no problems, BUT.... It was overkill this stuff is serious strong 20x20 would probably work well. THere is a pool of spares in the pits just look around and ask, but most likely you will never bend it.
We are planning on prottyping this year with BOSCH then building the final out of tubular about a week before we ship for weight since the BOSCH does end up weighing a bit when it is all said and done. Use it wherever strength is an issue and use it at the begining of the season for speed in assembly
Matt
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