This past weekend in Jacksonville, Florida the Mustang Club of America held its River City National Mustang show which featured around 400 Mustangs from all over the U.S. The show was a three day event that featured several classic and modern Mustangs along with one unique vehicle. That vehicle was a custom one-of-a-kind S197 4X4 Mustang Mudder. Looks like BIGFOOT has a baby brother. Check out the photos after the jump.