Thank you for the info Keith. I looked everywhere I could find on the internet and nowhere did I see this particular piece of equipment mentioned or for sale (I don't need one). I did need to know what it was called for a book I'm writing. Thank you again, Cheryl

PS
I and a friend of mine actually pulled a caisson and cannon at a reenactment at Pea Ridge years ago. We were with Douglas Battery. We were the only mobile artillery piece. We had a four up of 3 Hofflingers and a buckskin quarter horse. Great fun!!!