Ditto other opinions. I use a pair of 8-footers for a 17-ft boat, but that is in relatively quiet water, with the only wave action coming from boat traffic. Be especially careful to mount the base sockets so that they are anchored firmly to the dock frame. You can mount them to the deck surface, provided that surface is anchored securely to the frame. Many docks depend on the weight of removable deck sections to keep them in place on the frame. The pull of the whips when a good wave passes underneath the boat can lift even heavy deck sections.
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