LT tires are designed to be used by trucks that will be towing and hauling. Unloaded LT tires will not drive as smoothly as they do when towing a load. Therefore, if you have an SUV, and you are sure you will never be towing or off-roading, LT tires are probably not the best choice. Instead, go for P-metric (passenger) tires, which are lighter, and will provide you with a smoother ride, faster acceleration, and improved fuel economy.