Not sure how relevant this is but, I have a 12ft Zodiac inflatable with a
15hp 2 stroke Mercury outboard (weights about 35kg) I use it as a tender
to a sail boat. When I'm launching from the shore, and I can walk up behind
it, it's easy to fit. When I'm lauching it from the sail boat and I need to
lift it off the deck (4ft freeboard) , and mount it on the transom from
aboard the dinghy it's much harder, but not impossible. I working on a
method of lowering it with the boom direct onto the transom.