After 35 years of buying cars, I realize there are three basic ways of responding to an ad or a tip on a car for sale. The first is gathering information (talking with the seller, getting a description, asking for additional photos, etc). The second is going to see the car yourself, perhaps culminating in an agreement to buy the car and leaving a deposit. The third is what I call the full pounce. This is where you drop everything and drive directly there—with cash in your pocket and a trailer behind your truck—leaving no chance for someone else to buy it. Which option you choose depends heavily on the car in question and how badly you want it, plus your personal situation at the time.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2018/12/03/when-to-buy-a-car