Charity Auction. This 1977 TriSonic Caprice is being sold on behalf of the Courage Center. The boat features a Mercruiser 898 5.0L motor (winterized so it has not been started), some tops, an open bow and spacious seating in the rear. The boat comes with a 1977 tandem axle trailer. Rust to trailer. Tears in upholstery. Scratches to hull.