Mani (Moon) may or may not have a chariot; none is mentioned in the lore at all. Furthermore, we aren't told of any horses. Just that he "steers the course" of the physical moon and adopts two kids. So if you happen to be participating in a discussion of Mani where the subject comes up, you might mention that. You might even dig out a copy of my old handout of the complete lore references, available here:
http://www.mundilfari.org/cites.htm .
MAO