Resurrecting this thread with my take on a ladder, because I'm bored.
My wife and daughter wanted something to make getting back in the boat a little easier, but the price of the rescue rung, and its size, took that off the table. I found a couple used Metolius climbing ladders (Metolius Ladder Aider 1in - Aiders & Etriers | Backcountry.com
) on Craigslist for $20, took them home, and turned them into 4, four step ladders. They stow pretty tight by rolling them into the grab loop and securing with a carabiner. All you have to do is release the biner and unroll, and climb. Should make life easier during the summer when I'd rather worry about driving and not spilling my beer than hauling them out of the water.