Well, Tim, I have carried two spares since the early 70s. Have had to use both before getting the flats repaired about 5 times since then, 2 flats at once or before I can get out of where I am, and having two has meant not having to come down from the mountain before the hunting, fishing trip is over. Here in Western Wyoming, the roads are mostly all dirt and not maintained, and the wife and I like to explore a lot of these back roads. Bird surveys, checking on cows, both her families and friends, and just GETTING OUT. And my hunting roads, often called two tracks, are not known for being in the best of conditions, read chains for all 4 tires. ALSO, it seems, after the county starts grading the county roads, sharp rocks appear out of nowhere. Now I am NOT picking on the county workers, they have several thousand miles of dirt roads to take care of and NO I am not exagerating. If you look at a map of Wyoming and then Sweetwater county, you will see what I mean. Sweetwater county is 10,491 square miles in size with only 66 square miles of that being water. That means a lot of country to see just in the county! Also, I never have less than a six ply rated tire on the truck, ten ply most of the time, even on a half ton pickup.