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.
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'08 34' Classic SO, '12 Ram 2500 4X4, 6.7L Cummins.