If you are in the market for Freightliner 122SD aftermarket truck parts, you already know the 122SD is the ultimate work truck. These commercial trucks can haul everything from logs to heavy equipment to roofing with ease. Freightliner has designed the 122SD to be profitable, comfortable and better yet, dependable. 4 State Trucks is here to help keep your 122SD looking and driving exceptionally well. Shop exterior parts, interior parts, engine cooling, wheels and more for your Freightliner 122SD.