I just purchased a Zodiac Cadet 230 Aero (high pressure air floor) and Yamaha F2.5. They both store neatly (including oars, aluminum seat, and air pump) inside a Yeti 350 that I keep on the deck of my Express 330.
I have not had a chance to use the inflatable yet, so I do not know how difficult it will be to inflate or deflate, roll and store again, but it's a very neat and tidy way to store the boat so far. The Yeti also has a padlock to lock it closed, and I can lock the cooler to the gunwale of the Grady when I am away from the boat.
Since the Yeti weighs 89 lbs empty, the boat, motor and cooler combined have to weigh close to 240 lbs, so locking it to the gunwale is probably unnecessary.