I think most of us in the US carry a AAA card with the 100 mile flatbed towing package.
I will say that one of our AZ POCA members had a blowout on the way home from the 2015 Fun Rally in Houston, and he had a Ford high pressure spare in his car (good for him). Having the spare gave him a lot options, and it got him off the freeway, and back to town, where he and several other AZ POCA members were able to get a full size replacement.
While he didn't want to drive his car far on mismatched rear tires, it really helped him out in a tough spot.
Rocky
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