I walk up that ladder with 2x12l steel tanks on my back when diving + plus weightbelt and deko tank, total weight around 130-140 kg! No problem for the ladder, been used more than 1000 times now and no sign of wear on those bolts or on other part for that matter. More a problem for me!!
Its not perfect for divers though, but for swimmers and other watersports its really easy to enter the boat.
I will have it made 1 step longer and som sort of horizontal grip instead of the standard one.