This is how we did our motor out in 09.
In front 14' lion
next 16' Marravia SB raft
next two 16 cats side by side
last a 18' cat with a 10hp motor
all were lashed together, we had a throw bag on each side of the lion going back to the 16' cats. tighten or loosen to keep the line straight.
Worked great for an hour, then at 9am the big W reared it's ugly. I was in front and was soaked on the motor out way more than the rapid section, and I even took a swim in BDIII.
The trip out would have been horrid if not for the motor. Be safe out there, Dennis