I looked at the photo. Fairly complicated application. I would start with Hafele Hardware > www.hafeleonline.com < Hafele offers high end hardware for unique applications. In some cities (San Francisco) they have showrooms. Similar to a rolling bookcase ladder. They offer 2 weight classes > 40kg (88lbs.) Hawa Juinor 40 & 80kg (176lbs.) Hawa Juinor … Read more