We took a different anchoring approach than Ben, and it works like a charm. First, you're never going to anchor a floating rail so firmly that it sits still when the wake hits it. If you do manage, you'll be putting a lot of stress on the frame of the slider. The bouncing that you get when you get on the slider is a function of rider weight. A floater will never be as solid as a slider on piers, but barrels are cheap and you can get close by over-engineering the floatation. Think reserve buoyancy. After the rider crosses, you have the boat wake to deal with. The wake will want to lift the slider and foul/drag anchors. The remedy for this is to have elasticity in the anchor line. You don't want the bouncing slider to fight your anchors. A bungee anchor line lets it ride up and down with wakes and rollers without disturbing the anchors themselves. Use a setup similar to the Anchor Buddy. We used a segment of rubber bungees on each anchor and it worked perfectly. Our slider would stay put in the delta through tides, our boats wake, and the wakes of huge cruisers going by. Make sure you also have a separate, longer tag line for each anchor. You don't want to be pulling your anchors up via bungee.
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