I beg to differ on stainless vs galvanized. My mooring chain lasted 5 seasons. I am 5 seasons in on my stainless swim raft setup and it looks new. Our weight is a disk shaped concrete weight purchased at watermark. The chain loops through the center and connects with a stainless shackle. No parts to rust out.
With the depth you are talking about it is not a lot of chain. Do it right the first time.
A chain of proper length should not be dragging in the sand. Ours was measured to give just enough slack at a record high full lake to make the connection, and in lesser depth times the raft drifts just enough to keep it taught and not resting on bottom.
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