First time I seen those Mattracks was about a week about 9/11. The Farm progress show was held in northern Indiana, my FFA class took a trip up, I've got pics of where they took of of the Dodge T-Rex's and put those on it. Looked cool as hell. I remember talking to the guy at the booth. Said the idea actually derived from the owners 6 year old son who liked to draw monster trucks with tank tracks.