The problem with steps or platforms to help get in the boat is that the bottom step in that picture is about at the level of your throat when you are in the water. Find a ladder where the first rung is at the level of your throat and try to climb up it. It is very tough. Nobody seems to appreciate this.
You need something that goes well underwater to really work well. That is why climbing up the drive is so popular.
I wish I had a suggestion. Some type of ladder that is easily removable and storeable that extends well underwater is what is needed.
The steps in that picture are used after people climb up the drive.
Cheers,
Pismo
1996 22 Classic
Red with Stainless Windshield
Stock Gen VI 502 Magnum MPI-415hp
Stock Bravo I
25" Mirage Plus
74.5mph best @ 5050rpm GPS (Speedo said 80)
27" Labbed Mirage Plus
75.5mph best @ 4800rpm GPS (Speedo said 82)