Here you go bodyman.
http://conversiontrucks.net/Forum/index.php?topic=6.0
Quote from the above article: All of the information I have found so far indicates that one company (Custom Vehicles International in Arlingtont, Tx) actually made the extended cab conversion, then the truck was shipped to Tra-Tech, Overland Coach, or Western Hauler for final interior modifications and special paint such as the Tra-Tech truck.