Conklin had a Monster at the CNE in the 70's. It may have been booked into Crystal Beach park back then too. Conklin booked pieces in there sometimes back then and pulled them out for the CNE in August.
Strates had their Monster out from 1984- 1988. It was always on the inside end of the midway in Hamburg.
Gooding Amusement had one at the Ohio State Fair in 1974 too.
I have a picture of the Conklin one racked in Corfu, NY a few years back. I think it was on 3 pup trailers if I recall correctly. If I find the pics I'll put them in Webshots.