Look up the invoice price for truck you're wanting to buy. I would start your negotiation from there. The dealer will start from the discounted price they're offering. The MOST important thing to do is, never answer their question of "How much do you want your payment to be." Let them know right at the beginning of the process, that your concern is ONLY the purchase price of the truck, and the interest rate you will get. If you tell them you can afford $500 a month, and your payment could've actually been less that, they will most definitely put you there anyways, as it's a way to get more for the sale. So, like I said, First, look up invoice. Second, the ONLY thing you should be negotiating is the purchase price and the interest rate. When you get to finance, keep in mind, that they will be trying to sell you various things such as extended warrantly, gap insurance, etc etc... Those are also negotiable. Especially the warranty. Good luck!
Go to "car-buying-strategies.com." You can build your truck and it will give you both prices. It also give you options to input the incentives as well.
According to that site, invoice is $29,610 with a deal cost of $30,078. Guess I'm doing pretty well then, with all the rebates my net before taxes and reg is $22,300