Our 10 foot Avon RIB lives on the fore deck, most of the time right side up. It does get flipped over and secured for passages but for day sails or relatively calm sails between anchorages we winch the dingy up with a harness and sit it on a small fender by the mast and a large fender just in front of the hatch. We secure the dingy at the mast while the front rings on the dingy get tied off to a stanchion base. Once tied off we add some tension to the halyard which stays attached to the harness and the whole lot is very stable.
It is a little awkward getting around it to the fore deck but not a big deal and someone has to make sure a sheet doesn't snag when tacking.
The advantage of having a RIB for us has been huge. For a start the kids LOVE it! With a 15hp 2 stroke (70lbs) myself and 2 kids (approx 350 lbs) the dingy will to about 25/30mph through some pretty choppy water, fantastic utility for fishing, snorkeling, exploring or just getting somewhere fast. Anything over about 400lbs and the dingy will not get on plane. I installed a fish/bottom finder in the RIB which helps sound out the bottom before heading into a questionable anchorage and catch dinner
. Have even pulled the boat off a sandbar or 2 with the RIB as well.
The 15hp Johnston goes on the transom railing just fine but at 70lbs it is difficult getting it on and off. Some sort of crane would be recommended for most.
There are times when we know we will not use the RIB we just winch it over the side and just leave it in the slip giving us our fore deck back. Towing it costs about a knot and a half.
Hope this is helpful for someone.