Great Surly Big Dummy with powerful mid-drive e-bike system.
I purchased the bike new in 2016 and installed a Bafang BBS02 mid-drive system about five years ago. It provides lots of power for hauling kids or cargo, and is quite reliable and fun. Plenty of range with a 11.6 A-hr battery.
It’s a great bike that barely left my garage as my kids quickly moved on to their own bikes and I stopped riding. It surely has less than 500 miles on any of it (Bafang computer says ~100).
Also includes crank set, front, derailleur, etc. that were replaced with the motor, as well as an Xtracycle “Hooptie” for containing kids on the back.