Reefer Technician. THERMO KING OF FORT SMITH, AR Located in Muldrow, OK. Thermo King of Springfield, with a location in the Fort Smith Arkansas area, is a privately held company since 1966, specializing in the Midwest in new and used semi-trailer reefers and tripac APU units. We are currently seeking self-motivated individuals that are willing to learn and advance in the technical field of transport refrigeration repairs. We don’t just look to fi...