Put em in a line. Strap the frames stupid right, with boats partially stacked on each other. Passengers up front as far from hat noisy moor as they can get. Take turns on motor duty, or leave it unattended with a kill string and steer manually from the front.
(Note there is a learning curve on this, but it will pay off once you figure it out.)
Again, all connections are frame to frame; no D rings whatsoever.
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