The difference in price between an LT and a P tire is minimal in my experience. I am not arguing that the P series tires will not work nor that they won't handle a load. I am simply saying that the LT tires generally last longer and handle loads better than a P series. I went from a P265/70/17 to an LT285/70/17 on the Expedition and immediately felt a difference when towing, even with our little pop up. The pop up trailer had sway issues before and when I went to the LT285s the sway issues disappeared. I have found the LT tires to be more stable under load, but they certainly do ride stiffer when unloaded. To each his own. For the majority of people out there a P series tire is going to be the ticket. I am just saying that the LT tires will handle a load better than a P and will last longer.