If you doubt the robustness of the dock, it is very easy and cheap to dramatically strengthen it with a pair of cables connected to the corner posts on the diagonal directly under the deck framing and tightened up with turn buckles. 1/4" is plenty strong enough. They can't be loose, but they don't need to be guitar string tight. That said, an extra set of diagonal cables between the deep end posts and some posts near the middle would probably be a good idea considering how skinny and long the dock is. Diagonal leg bracing under water is always a good idea too.
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