I usually specify Richard-Wilcox hardware (www.rwhardware.com) for these types of applications. They have been around since 1880, which is about the date of the barn in the photo.

If you are interested in different styles of Barn Door Hardware we also have a wide selection: http://rusticahardware.com/barn-door-hardware/

Real Sliding Hardware sells quality sliding barn door hardware made in the USA! Check it out: http://www.realslidinghardware.com/