Thanks all. As Mariekie notes, these were built by the Cayo brothers. At one time they owned Avion, and when they sold Avion to Fleetwood, they retained the very small truck camper portion of the business for a few years. My rig was manufactured shortly after the sale. Cayo is still in business as a service center. I understand that they still make a few custom one-of-a-kind truck campers on a special order basis, but serial production ended in the mid 1970s.