[techtiger1]

I've actually seen them used at Rapids water park they allow the inner tubes to be moved by workers once they get to the top in any direction. The setup looked very similar to the pictures. There was also a really large conveyor system to bring the inner tubes to the top. That waterpark is fun but also very intersting as there is alot of engineering that needs to be done to accomplish it. This is the case with any amusement park I suppose.

Two cents in,
Drew