After eight and a half years, I'm considering getting a new truck. My current one is sitting at the end (beginning?) of the driveway with a "for sale" sign on it. I'm asking $3,000 more than what the dealer is offering. From what I see advertised in the papers for a used truck, what I'm asking for is a steal. Man, the mark-up car dealers get is unreal! The trouble is two-fold. One, I don't get mu…