We’ve been using an inflatable dinghy with an inflatable floor in the San Juans for about 3–5 weeks each summer over the last four years, and it has worked very well for us. We have an Achilles 8-foot dinghy, and I run an EP Paddle electric motor on it. I know inflatable floors get a lot of criticism, but we’ve had absolutely no trouble with ours.
The big thing is how you land it. You don’t want to run it up onto the beach. Like others have mentioned, that’s how people end up damaging or losing the floor. What we do is simple: when we’re about to reach shore, the first person steps out while the boat is still floating, then the second person steps out, and we carry the dinghy up the beach. That keeps it off sharp shells, rocks, and barnacles.
The dinghy weighs about 56 pounds, and we store it on davits on the swim platform. It won’t fit in an 2015 R25SC locker. That may partly be because Achilles builds a pretty solid inflatable,it’s not a thin plastic inflatable. You might be able to store it on the cabin top, but 56 pounds is still a fair bit of weight to lift.
I deliberately chose not to go with a fiberglass bottom because of the added weight. I don’t like putting more weight on the stern of the boat if I can avoid it.