Nobody here knows your driving style so or what road you'll be on for 10 miles..... Why not buy one of those 12volt air pumps and air up when you get to hard pavement?Sorry to revive an old one. Wondering about sand driving since we are headed to Oregon next week where I can go out on the beach. It will be the first time in the Timberline, last time was in my Excursion. If I air down to 20 to get through some of the soft stuff, how long on the road is ok to drive and below what speed? Nearest gas station is nearly 10 miles from the beach spot. Thanks for advice on this.