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Mine is setup with 3 pulleys, with dividers (rope wrapping) near the edge of the back bar. When I pull two people at once, I use the outer pair of pulleys, which end up about 7' apart, and when I pull just one I use the middle pulley.

When I bought it the person at Turboswing said it was strong enough for up to a 3 person tube. We mainly wakeboard but have pulled some with a 2-person tube with two adults - no problems with it.