From experience, I would never get a slip that had concrete piers. I had a very unpleasant awakening when my new boat was slipped at a concrete finger dock and, as the lake level dropped end of season, my boat was low enough that the fenders were below the edge of the dock and bolt heads and rebar in the concrete had several weeks chewing time on the side of my hull and the swim platform.
No matter what the material of the dock, make sure that you look it over and anticipate where your boat will be in the fall. Fenders under the dock protect nothing.
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