I'm of the generation, that we have always had spare tires, my r.v. has one. Was on the back bumper, but my husband, relocated it under the rig, so he could haul his trailer with his antique car on it, also a carry unit he made for the hitch, for excess stuff we carried at times.(big aluminum box).
I have really been glad I have had this spare two times since driving alone. One in a forest part, way down in a gorge in the Tn. mts. and then the famous Eagle mt. blow out. which happened on a Sunday, would have been hard to locate a tire then. GS, just sends a guy out with the tools, an air compressor , in case it needs some air et. and I am all fixed up.
These tires these days, you need a very strong person or an air wrench(whatever they are called) to get the lugs off. In both cases it was the inside tire and they are heavy , so I really wouldn't want anyone except a professional to change them. Used to change my own tires, now I would never dream of it. (Probably couldn't
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I would feel like I was leaving something at home, if I left without a spare tire on either of my vehicles, but then too, as I said, I am of the generation that we always had spares, not these donut thingings, they try to give you now, if anything at all. Progress in some things, I don't think is progress. Trying to buy a spare somewhere , for a big rig, might make for a real long delay in a trip.
It just comes down to what you are comfortable with and your own opinion in any given situation.
Safe and Happy travels,
Carol