Tractor performance on different surfaces can be predicted using a new method called the Vehicle Number (Vn). This method simplifies the process by considering the front and rear mobility numbers and the weight on each axle of the tractor. By comparing the Vn method with another method, researchers found that Vn is effective in predicting how well a tractor interacts with the ground in various conditions. This means that Vn can help determine how well a tractor will perform on different surfaces without needing to calculate the performance of each tire individually.