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 time is always right, to do what's right." MLK
'08 34' Classic SO, '12 Ram 2500 4X4, 6.7L Cummins.