Harmon Truck Service

Harmon Truck Service operates as a heavy-duty truck repair shop in Sullivan, Missouri, positioned between Rolla and St. Louis along Interstate 44. Established in 2015, the company provides in-shop repair services in Sullivan and mobile truck repair within a 100-mile radius. The shop is open Monday through Friday from 8:00 AM to 5:00 PM, with roadside assistance available 24/7. Harmon Truck Service is a member of the AMBEST Service Centers network and offers repair services backed by the AMBEST Freedom Warranty. The company's services include DOT inspections, fleet services, general diesel repair for engines including Cat, Cummins, Detroit Diesel, Mercedes, International, Volvo, and Mack, preventive maintenance, roadside assistance, mobile truck repair, trailer repair, heavy equipment repair for machinery like Bobcats and excavators, coach and RV repair, truck welding and fabrication, axle repair, brake repair, collision repair, coolant system repair, and body work. They also supply heavy-duty truck parts from manufacturers including Freightliner, Thomas Built, Detroit Diesel, Buyers, Velvac, Alliance Brand, Donaldson, and Fleetguard, and partner with third-party providers for towing services.

Statewide figures for Missouri. Source: AAA survey data, state averages, updated January 2026. Harmon Truck Service sets its own prices — call (573) 468-5138 for an exact quote.