Hillmuth is a family-owned business that services vehicles of all makes and models, including RVs and trucks. The Columbia company, one of three Hillmuth service facilities in the state, is certified to conduct Maryland State Inspections and emissions inspections. Hillmuth has grown from two technicians when it opened in 1978 to 12. This location is open every other Saturday, but customers are welcome to contact the Clarksville location when this one is closed.