WELCOME TO TRUCK-TRAILER SALES & SERVICE, INC. Truck-Trailer Sales & Service has been selling quality trucks and trailers since 1965! We carry a great selection of various used trucks and trailers. Our inventory is always changing, so check our equipment page often! We carry a complete line of parts, and service all diesel and gas engines. We are located in Yankton, SD at 3201 East Highway 50 with easy access from I-29, Exit 26. Truck-Trailer Sales & Service, Inc. is an authorized service center for Cummins Engines and International Trucks.