The fold down Airstream steps can be a real problem if you ever let the fasteners get loose. All of the parts are available from Airstream, but since they are Airstream specific, certainly not cheap.
I have friends that use a box for the first step rather than repair the fold down part because it's such a pain. Hope this parts drawing will be of some help.
Good luck with this, and welcome to the forum.
"The further a society drifts from the truth, the more it will hate those that speak it." George Orwell
'08 34' SO, '12 Ram 2500 4X4, Big 6 cylinder sludge burner.