Can anyone point me at a hardware source for heavy duty sliding door hardware. I am designing a pair of light weight bookcases that will slide on overhead tracks hidden by a valance. In the closed position, the bookcases will butt together and they will conceal a Murphy bed. Slide to the sides to open the bed.

These bookcaes will not be heavily loaded. Mostly art decor items and a few books.

Appreciate tips from anyone who has been there.