When you walk into a dealer and get the smart sales guy that tries to sell you something you "don't want" you say "I am looking at a truck.

And here is the truck I want, and have a page full of RPO codes to hand to him. And tell him if he cannot produce this truck at the price I am willing to pay, then don't call me.....

And then walk out and leave. (This would only work if you are ordering a new truck) cause with a used truck, you get what they have to choose from.