Just a guess on my part... try to contact PeeWee via Air Forums. You'll find posts from him as well as threads he started regarding Airstream and WBCCI in the early days. His mother was one of the early organizers of WBCCI. If he doesn't have the information maybe he can point your in the right direction.
Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...