help?

I seem to be absolutely horrible at doing Google image searches.  I have been realizing that I don't know enough about what a caravan wagon might look like, for this story that I'm writing (so damned slowly) so I punch in caravan and wagon and come up with... covered wagons from the American west and campers.  "Caravan +trade" gets me lots of camels.  Um.  Maybe I'm totally wrong and they shouldn't be using wagons at all, just pack animals?  *whimper*  I don't even want to think about re-writing all that.  They need to be using wagons. :(  Does anyone have any idea of how to get pictures of wagons that would be used for a trade caravan, drawn by mules?  I didn't have them use covered wagons because I just associate those too much with the American western frontier, but maybe that is what they really should have?