As both sides made extensive use of mule transport it would be nice to have some available, either 'generic' or models specifically for CW and Japanese forces. I could live without Japanese elephant transports. :)
There is a mule in the fantasy line, that I think people have used.
Yep, as Fred says, there's the AC21 Pack mules in the Fantasy Accessories range, and then you could also get away with the mules from the North Western Frontier range, codes NW11 and NW12.
8)