According to this info from a history of Four Wheel Campers on the Equipt web site, Jack Billings owned FWC in the late Eighties....
"The Seventies and into the Eighties were a heyday for Four Wheel and the RV industry. A major change in ownership occurred, and Jack Billings eventually became the owner of Four Wheel Campers in 1987. A couple of years later, the company moved to Woodland, California, and has been there since. Production bumped along, and then Ben Burnett bought the company in 1996."
Jack Billings is Jack T. Billings, thus the J.T.B. Industries business name on the plate. So in effect the company that manufactured the camper is J.T.B. Industries who at the time owned the Four Wheel Campers brand (and therefore your camper is indeed an FWC one).
According to this Bloomberg page, the company Four Wheel Campers, Incorporated was founded in 2001. It would be interesting to see what plates show on campers built during Ben Burnett's ownership (i.e., between 1996 and 2001).
You may also be interested in this 1989 Ranger II restoration thread. (click on the Expedition Portal link in post 1 for more details) Nice!
.
Edited by Old Crow, 29 January 2019 - 05:41 PM.