trailer queen
n.— «In subsequent years, Vandervort had a team of mechanics completely restore the car. Last year Vandervort won first place in his class at Concours d’Elegance and will be showing the car—affectionately called a “trailer queen” because he keeps it off the road to preserve its condition—there again this year.» —“Classics to shine at 2007 Concours” by Christian Gaston News-Times (Forest Grove, Oregon) July 11, 2007. (source: Double-Tongued Dictionary)