I think nads may be incorrect about draft animals. I had thought that a while back I had nadined/googled that the Aztecs used ladies of the evening as a type of draft animal. According to what I nadined, if I remember correctly, that is where the phrase "screw you and the whores you rode in on" originally came from.
All this fictional spirit-guiding sometimes causes my mind to drift so maybe I'm remembering incorrectly.