A pulling tractor is a specialized vehicle designed for competitive tractor pulling, a motorsport where tractors pull heavy sleds over a set distance. These tractors are modified for maximum power and torque, often featuring high-performance engines and reinforced frames to withstand the intense forces involved. In tractor pulling events, competitors aim to pull a weighted sled as far as possible. The sled's weight increases as it is pulled, making the challenge progressively harder. Pulling tractors can be categorized into different classes based on their size and engine type, including super stock and modified categories.