For those who travel to not so populated areas where first you may not have a signal, second it hard telling how long it will take someone to get there and third just the security of having the spare. I carry a 20 ton bottle jack, takes up very little space. Piece of mind is priceless. Now if I didnt have a spare my option would be if on the rear, just remove the blown tire, if on the front, remove one of the rear duals on the lightest side and put on the front until I could get to a repair facility.