Sounds like an interesting development for the bitcoin economy. Being able to buy cars in BTC is a big step forward.
There is a map based on OpenStreetMap located at
www.coinmap.org which shows bitcoin accepting businesses. If you give me details on where the dealership is I can put it on the map for you. I also offer a separate service of improving the map around the business for a small fee paid in bitcoins, but I will put it on the map for you for free whether you choose to take advantage of my other services or not. I think there is already a car dealership in Kansas on there, but I don't know if they sell cars in BTC or just do repairs or what.
Anyway good luck with the car sales, hope it goes well for you, and I am glad to see the bitcoin world growing to accept more sophisticated things like this.
-AndrewBuck