The S3009 Vin# is of the correct year, 1966. As for the title having the CS66518 Vin#........it is an incomplete Shasta Vin#. The should be a number in between the C and the S and that particular vin# is for a 1960 or 1961 Shasta and more than likely, it was for an Airflyte.
The S3009 Vin# shows that the Shasta was built in Columbia, South Carolina. The Vin# on the title is from the California plant.
I would be willing to say that the incorrect Vin# that is on the title is from a camper dealer that had an extra Shasta title and your Loflyte was traded or purchased without a title. Thus the dealer attached the incorrect title to the Loflyte.
I would look into what it would take to have a new title created for your Loflyte. It may not be cost prohibitive, but worth asking a few questions. Just act like you never had a title for it.