I, too, have a Mariner. I chose to use a gunwale hook ladder. My choice was mainly influenced by expediency; I wanted a ladder for swimming, but I did not want a project that would require very difficult body contortions in a barely accessible area of my boat. So a permanently transom-mounted ladder was put at the bottom of the improvements list. Meanwhile, I love the ladder I got (Jif EPV4
http://www.jifmarineproducts.com/marine/products-details.php?product=117) for these reasons:
- Long; easier to lift myself out of the water because I don't have to reach a foot way up to the first rung.
- Heavy duty; a solidly built ladder is easier to use and will last longer than than a flimsy model. Well worth the extra expense.
- Platform rungs; easy on bare feet, not slippery
- Telescoping rails and rotating hooks; makes storage easy.
The downsides:
- People claim that a stowable ladder won't do an accidentally overboard solo sailor any good. My reply is that if I'm knocked overboard while single-handing, no ladder will do me any good because the boat will sail off on its own.
- There is a potential to drop the ladder outside the boat and see it sink. I have a leash on my ladder. the leash gets clipped to the boat before the ladder gets deployed.