Found this listing today for a one owner '69 C20 Custom Camper Longhorn BB/T400. The truck was always very local and lives about 25 miles for the original selling dealer. Owner is in his 80's and bought the truck new to haul a 10 1/2' Monarch camper. The bad news is it is a 20 year old color change from light green/white two-tone to black. Even with that I'd still like to have it myself but....
http://inlandempire.craigslist.org/cto/3205645026.html