I do not believe that the earlier model Scamps had a 2" ball - my 1992 16' still had the 1-7/8" ball. Perhaps the tongue and hitch have been replaced which may have resulted in the
VIN being cut off or welded over.
If you post a photo of the rear of the trailer - the taillights will give a better idea as to possible vintage as that is also an item that Scamp has changed the shape of with time.