the box is frp, I was going to build a steel frame around the opening, im almost sure that the slide will be 10-12 ft. ill keep checking to see your pics. I looked at a few and this uit I have is pretty decent it has 2x6 rect. tube, and it has rollers on the ends of that that the other tube slides inside, I the middle it has 2 round tube guides, it the heaviest duty one that ive seen
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