I am planning a trip to Sequoia Nat'l Park in December. According to the park website, you are supposed to have tire chains in your car during winter, but I asked in Hertz (that's where I am renting the car) and they told me that they don't allow tire chains in their cars and that they have snow tires in all of their vehicles. Any suggestions? What could happen if I don't have tire chains installed? I already have reservations at Wuksachi Lodge, but don't know what to do about this issue.