Modified 4WD Trucks (4WD) are perhaps the closest in appearance to what the average Pickup Truck on the street is. 4WD trucks utilize both rear and front wheels to pull. With no turbo charger, or supercharger to force air into the engine, a competitor in this division must rely on the engine itself to pump as much air as possible and that means that engine settings like the proper air/fuel ratio are more important than ever. While steering and throttle application requires a lot of “finesse”, another huge challenge is placing as much weight at the front as possible, which allows the front two wheels to pull and claw a pathway early on, before the increased weight of the sled puts the final emphasis on the remaining pair of spinning tires at the rear. They have a weight limit of 6,200 pounds.