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John_B_Clarke t1_iyotk7o wrote on December 3, 2022 at 12:12 AM

https://www.americanpoleandtimber.com/wood-timber-products/challenge-course-zip-lines-ropes-course-materials/ looks like they have what you're looking for. They say they have posts up to 52' long and 20" diameter. How much they charge I have no idea.