This video link will take you to a demonstration of borax wagons that were restored at Engels Coach Shop in Wyoming for a museum in New Mexico. There are a couple spots where they demonstrate the hitch turning a corner. About the 4 minute mark you can clearly see where the teams nearest the wagons are on the outside of the chain. If you watch closely throughout the video there are points at which mules can be seen jumping the chain. There's one mule in particular that likes to pull on the off side and jumps the chain even when not asked.
https://www.youtube.com/watch?v=S_Thvbp0rPo
Hope the link works. Otherwise just search YouTube for "20 mule team jumping the chain." i didn't finish typing it before it came up as a suggested topic.
I do subscribe to Engel's channel. He does some amazing work in a mix of traditional and modern methods.