I have a friend that has a 1918 Swiss Ammo cart pulled by mules. If anyone is interested let me know and I will put you intouch with him.
http://www.surfacezero.com/g503/showgallery.php?cat=500&ppuser=2217
http://www.surfacezero.com/g503/showgallery.php?cat=500&ppuser=2217