Minor correction to the above post - The manufacturer of the Falcon and Horizon Class B's was "InterVec" (this was short for International Vehicles). They later became the Phoenix Cruiser company and made Class B's and then Class B+'s.
I had a 1985 InterVec Horizon "clone" made by a small RV manufacturer called New World. Very nice Class B. It had the exact same fiberglass hi-top and the same interior layout. Actually several Class B manufacturers used the same hi-top. However InterVec later made two improved versions of the hi-top that were larger and were proprietary designs.
I also have a 1984 InterVec Falcon/Horizon Spec Sheet and a 1986 InterVec Falcon/Horizon Sales Brochure. I tried unsuccessfully to attach photos of their covers. I like to collect vintage brochures for my RV's when possible. If anyone is interested in these 2 InterVec brochures let me know.
Now: 1998 Coachmen Starflyte FRB 21' Class B+
Formerly: 1996 Coachmen M19-RD GMC 19' Class B