I keep two spare tires in my garage, a hockey puck in my trunk and a AAA membership as a backup in case Tesla roadside assistance falls apart. A number of people have posted that even after they got through Tesla informed them they did not have any spare tires available which pretty much defeats the purpose of having roadside assistance.
There also don’t have spares for snow tires, at least they didn’t last winter. I waited almost 1hr to get through and almost another hr for the truck. Was a Thursday evening if I remember correctly.