Well three months later and I have yet to try the ladder on the water. I've only had the boat out once for a short ride in a small craft advisory. So I guess I have time to work on it.
Not aluminum yet but I had some starboard laying around so I made a stop for the new ladder. Seems to be ok, the starboard might flex a bit too much, we'll see. It does take the strain off the tube attachments but does push on the tubes. Shouldn't be worse that the rope from the old ladder. I like the travel position. Just need to figure out how to hold it down.