Hey what about this one, It's called the Folding Latch Type Swim Ladder - 3-6.
It folds, and it hooks on to the side of the boat. I guess I would have to put backing plates on the hardware. This one is also made by Garelick for around $178. http://www.garelick.com/product.php?pnumber=12048
this one has 6 steps so maybe it would go below the water line enough to allow for easier boarding.
What do you think?
mike