My docks are on pilings, 6x6 posts. When I had them redecked last year, we extended the T dock 4 feet by cantelevering, extending the floor joists out 4 feet beyond the rim joist and back 6 feet to the back of the T. It's quite solid and provides extra seating and standing area, and it provides a bigger shade area under. I already had several trees at the end of the dock so they are now under the extension.
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