The track and trolley are antique pieces that were salvaged from an 1800s barn in southern Wisconsin.

anyone know of source for barn door style hanging hardware

You canfind new and reproduction versions with a range of prices. You can search for them online (search for "barn door" or "barn door track") or ask your local retailer who sells parts for building sheds and/or barns. Here are some that I've found online...
Specialty Doors (used by The Pioneer woman)
Ace Hardware
Aubuchon Hardware
Hafele
Better Barns
McMaster

Basin Custom
We sell barn door hardware. Our tracks are very high quality and have many unique features that make our tracks a great choice! Our tracks have an anti-jump piece to keep your tracks in place and a soft stopper at the end so your door isn't slamming into a piece of metal at the end of the track. Our wheels are specially designed to be completely silent and smooth! We can customize you track length and color to fit your needs and are happy to answer any questions you have! call, email or visit our website! tel:208-261-1276 info@basincustom.com, http://www.basincustom.com

We also make sliding barn door hardware. Check out our Horseshoe Flat Track hardware kit on Houzz. It can support up to 550lbs without looking "heavy duty." Give us a call if you have any questions! 800-694-5977.