Thats what I was thinking. I wasnt sure if equity really applied since cars depreciate so fast.Done it a few times.
Dealer makes an offer on your car.
If you owe 10k and he offers 9k, you roll 1k into the purchase price of the new ride.
Depending on your situation, car, mileage, goodies, you may not owe or may have some positive equity in the car.