You can find the values of Freightliner trucks at CommercialTruckTrader.com, Ryder.com and TruckPaper.com, as of 2015. Most of the websites' listings are from truck dealers, but several private parties have listings for used trucks.
The value of used a Freightliner truck depends on the truck's condition, mileage, year and model. New on-highway Freightliner trucks sell for around $130,000, depending on the model.
Commercial Truck Trader's listings include mostly on-highway trucks, including sleepers and day cabs, but it also has listings for flatbed, dump, utility and straight trucks. Users can sort the results by the class, with most falling in the heavy-duty range.