I too am concerned about boarding over the stern and opted for a side mount ladder. To my dismay, I discovered a couple of weeks ago that if there is any current at all the ladder will lift out of its brackets when the swimmer takes hold of it. We executed the quick stop after the swimmer jumped in. There was a tidal current running against us (probably a half knot) and the swimmer had to swim pretty aggressively to get to the Type IV and then when we pulled him to the ladder, one bracket released as soon as he grabbed it. We were in pretty smooth water, the wind was about 12kts and it was much more difficult that I would have expected. Keeping the ladder in the bracket is now a priority. Any suggestions?
We are planning to get a canvas or dacron triangle, about 10' on a side, with grommets & snapshackes on the corners. We'd attach two of the corners to our stanchion bases and drop the other end over the side the "victim" is on. Then the "victim is placed in the bunt of the triangle, and lifting tackle (attached to our running backstay) is secured to the third corner. Hoisting on the tackle holds the victim close to the boat, lifts him up, and essentially deposits him on deck, even if he's unconscious.