Robert M. Burnett, president of National Auto Research (NAR), has announced the addition of trailer values to the Black Book Official Used Heavy Duty Truck Guide beginning with the February issue. "This is something that our customers have asked for and we are pleased to be able to deliver it to them," Burnett said. "The combination of used truck and trailer values within one publication provides Black Book with a unique product in this market. The combined publication will contain values for the six most widely used trailers in the commercial market, and as interest warrants other types may be added." The six types of trailers covered include dry van, refrigerated van, steel flatbed trailer, dump trailer, curtain side trailer and drop frame trailer. Wholesale, retail and loan values are given for the trailers in their base configuration with adjustments for equipment variances. Each trailer type lists specifications that are used for the base value as well as minimum condition requirements. For more information, call Black Book toll-free at (800) 554-1026. About National Auto Research National Auto Research is a Division of Hearst Business Media, an operating group of the Hearst Corp. The Hearst Corp. (www.hearst.com) is one of the nation's largest diversified communications companies. Its major interests include magazine, newspaper and business publishing, cable networks, television and radio broadcasting, Internet businesses, television production and distribution, newspaper features distribution and real estate.