When I was in the local water ski club, we used a system like that to anchor the ski jump in place. The only difference is that we made an "X" with the anchors on the bottom - we didn't run them straight up. Pully on the right had the cable running to the anchor that was under the pully on the left, pully on the left had the cable running to an anchor that was under the pully on the right. It worked very well. The problem that we had was not making the cables long enough for high water. The local rugrats would all climb on the jump, making it sink, then they'd all bail off. When it popped up, it would pop up high enough so it'd slightly yank on the anchors because the counterweights would slam into the bottom of the jump.

Due to those problems and concerns about liability we pulled it off the lake (public lake).

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