I'm no salesman, but first thing you need is find what the invoice pricing of the truck and options you want. Most good dealers will sell at or slightly above dealer invoice (maybe a few hundred over invoice). Being as 2003 are on the lots I'd bet you can get a 2002 for below dealer invoice. Since dealers are probably eager to move any remaining 2002's I'd refuse to pay such things as dealer mark-ups, dealer prep packages (expensive wax jobs, scotch guard treatments), etc. I'd bet dealers would be willing to give to your demands since the longer a truck sits on thier lot the more it costs them in intrest charges. One of those websites like Edmonds explained this and after so may days a truck sits on the lot the dealer starts loosing money. And since 2003's are on lots it's probably getting harder by the day to sell remaining 2002's. You can find the latest incentives at Dodge's website. The most important thing is to find out what invoice cost is for a truck equipped the way you want!!! If you don't do this you are basically walking into this blind and the dealer will take you for a ride. There are lots of websites (Kelly Blue Book, edmonds, etc) which show both MRSP and dealer invoice pricing for a truck and options. May not be a bad idea to try and get some quotes from several dealers to compare price, plus you can use this for negotiating leverage. Letting the dealer know you have scouted the competition and know what invoice pricing is I think sends a message you are serious, so no messing around with the numbers game. You truely need to do some homework before taking the plunge. Be wary of hiding costs like DOC fee's, prep fees, etc. Sales folks are good for quoting you a fantastic price, then when you sit down to sign all these "other" fees and crap magically appear. I know this first hand and walked out in the middle of signing papers for placing an order.
If you can, deal with the Fleet sales dept. They don't work off commision therefore you get the best deal without all the salesman hassle of dickering about price. My Fleet sales dept gave me a price quote showing MRSP and dealer cost for my truck and all options. They sold it to me at dealer cost plus $250. No hassles, none of the "give me a price and I'll run it by my boss" crap, etc. Heck they did not even want a deposit or require I sign anything holding me liable should I back-out and change my mind. I spec'd out the truck I wanted, they placed the order that day and said they'd call me when they got a VIN # and build date. In my case it was cheaper to pay the local dealers $250 mark-up than to take time off work and travel out-of-state to one of the volume deealers. My local dealer made the sale because of thier honest up-front pricing. There where no surprises, like the other local guy I walked out on (who still came in $200 cheaper, but lost my sale due to thier dishonesty on pricing until they got me in the office).
Don't fall for the trade-in thing!!! They will manipulate the numbers to thier advantage. Typically they will give you what looks like a good price for the new truck and practically give ya squat for your trade. When tring to negotiate this way it gets confusing real fast and is hard to keep all the numbers in perspective. Then they further cloud things with all thier mumble-jumble talk making it sound like your are getting a "fair" deal on both accounts. It is best to not even mention trade until you have established the lowest possible price for the new truck ON PAPER (not verbal, which they can then go back on), then mention "oh yea, I have a trade". Honestly you will get more from your old vehicle by selling it yourself. When I was recently shopping for my 2002 truck, only 1 of the 7 dealers asked if I had a trade. I think most new car dealers don't want to hassle with used cars. They can probably make more from the 3% holdback's they recieve from the factory for selling you a new truck than trying to sell an old used vehicle.
Sorry I got so long winded.