I wouldn't span 16 ft with 2x12. 2x10 joists attached to the ledger board with joist hangars. 2x12 joists are also expensive.
Support the deck in the middle and end with 3 ply beams (2 ft cantilever on the end) on post saddles into concrete "piles"
We dug our piles with one of those augers and it made a large hole. I would suggest a small auger to save on concrete costs.
You'll be able to park a tank on it.
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