V belts are components in the drive systems of Class 7 and Class 8 trucks, responsible for transmitting power from the engine to various auxiliary systems like the alternator and water pump. These belts are specifically designed to handle high torque and load, ensuring consistent performance in demanding conditions. With their sturdy construction, V belts help prevent slipping and excessive wear, contributing to the overall efficiency of the engine's accessory systems. They come in various lengths and profiles, making them suitable for a wide range of truck models and applications.