We built the 16'x28' frame in 4- 8'x14' sections at our shop. Also on the top of the pile is our 8'x12' long gangway. We used 2x8 pressure treated framing lumber with heavy duty marine grade hardware.
Once the framing is complete, we load all the dock sections and premium dock floats onto our trailer and haul it out to the job site. Building the docks at our shop shaves tons of hours off of the dock building process.
Our floating docks are very stable, heavy duty, and custom built to last a lifetime!
I dug up a completed pic of this dock: