Wow, you weren't joking that he was asking 9500. I thought you made that figure up to make it look like you got a better deal if you did buy it.
Lots of good advice here, I'd stay away from it... Any douche bag asking double KBB for a ragged on, beat up, rusted out truck isn't even worth dealing with.
You don't even have a conceivable starting figure, how the hell do you expect the owner to reason with you? I'd continue my search elsewhere...