18K downpayment is nothing, i walked out from a dealership with Full payment for the truck in my hands , only because they did not want to do the documents the same day/evening (i was there at 3 pm)
called a different dealership 10 miles away , they had a truck , gave me 200 $ better price, , i drove out, the same evening
My second bying experience was even more interesting , not only a dealership lost my sale, they also lost my respect to them.(Marlboro, MA)