Thanks for your comments, folks. I'd like to go the the same area again and try and find some more. Maybe this fall when it has cooled off again.
looks like a great time! Tell me more about that water can holder if possible?
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Matt used a hitch, and added some rectangular tubing to it with the two can holders (Blitz, IIRC) bolted to the top. Simple, and tucked up and out of the way for the most part. Those are Andy's Scepter cans on the back there, and he learned firsthand how rubber gaskets+gasoline=broken flanges and leaks.
Here are a couple more photos from the trip:
The cliff which contains the structures: