They may tow you to a dealer who may or may not be open when you get there and may, or may not have the tire you want (size and brand) in stock and who may or may not sell it to you at a "reasonable" price. Not to mention that you might also need a rim which they probably won't have in stock. On the other hand, if you have a spare with you they will put it on for you at the side of the road and you're on your way. Or, with some tools you can do it yourself if you are so inclined. My spare (wheel and tire) cost me $150. I hope I never need it but there it is. Some folks have peace of mind with just roadside service as you suggest while others of us want a bit more control over our fate. Both are good. Enjoy your travels!
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