The simple answer: do your homework in advance of any contact. Look at offers for similar vehicles and know what you want to do, and know that time must me on your side. If they laugh in your face, don't take it personally but resolve to get what you want. Eventually someone will meet your demands. But to presume that you can walk into any place and walk out with a vehicle on your terms is not likely. They are in the profit business and they are good at it. Patience is pretty much all you have on your side. And make sure they don't make some last minute changes. That resets the negotiations time clock. Good luck.