I kept one of my old tires as a spare also. I don't carry it with me, but keep it at the house in the back shed. In the event I ever need a spare, I'll attempt to purchase a new tire, but there's a chance it may take a couple of days to get the proper tire. When I put the current set on they had to be ordered and took a week to get them. So the spare tire would only be used to get the motorhome home if nothing else was available. My plan was that if I ever went on a long cross-country trip, I'd throw the spare in the bed of my toad which is a pickup so I'd have it if needed. My pickup is gone and now my toad is a Jeep, so for the next cross-country trip I'll just go without a spare and take my chance.
