5 to 1 scope for a swim raft is ludicrous!
Ours was held by either a 250 or 500lb concrete disk with stainless chain. There was enough chain for it to be pulled a few feet out of the water at full lake. I cant recall which weight, but it was definitely no more than 500 because we never would have been able to move it. We bought the package at Watermark and towed it out. The weight and chain were on a pallet on the raft, when we got it into place a few of us tilted the pallet the weight was on and dumped it in and set. It has never moved an inch.
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