Response on your ad
When you get a phone call or e-mail from someone interested in seeing your race trailer, you can safely assume that they are attracted by what you have to sell.
Therefore you will not have to "push your product". You will, on the other hand, have to be patient and expect to answer many questions. Make sure you have all the basic info on hand: Make, model, mileage, color, general condition, years of ownership, whether accidented or not and asking price.