This is a very interesting paper that argues for a nomadic origin of early Daoist thought. I would be interested in your views. The paper can be found in two places:
https://www.researchgate.net/publication/400734950_SINO-PLATONIC_PAPERS_Zhou_Dynasty_Indo-European_Nomadic_Culture_The_Origin_of_Early_Daoist_Thought
https://independent.academia.edu/ShaunRamsden