Find all the aftermarket safety, air, and electrical parts to meet your top-notch safety standards at 4 State Trucks. We carry a large selection of safety, air and electrical parts to make us your one stop shop. Shop for aftermarket airlines and airline boxes, electrical cords, roadside gear, safety flags, and more at 4 State Trucks to keep your Peterbilt 375 running smoothly. Find everything you need to keep you and your Peterbilt semi truck safe at 4 State Trucks.