What would be a good starting price to advertise?
I would put that truck on ebay with a $1 first bid no reserve. By the time you're at $1000 you'll have over a dozen bids. With the dry climate you and the truck are from, I bet it fetches $2500 or more. Nice thing about ebay....it'll sell for sure.
Otherwise I'll stick with my earlier estimate..that truck seems like $2500-$3500 in the current market for a very solid truck. Considerably less if rust anywhere but in the lower rear cab corners