I would not want a vehicle without a spare, whether it is a car, truck or RV. I know a lot of manufacturers don't provide them anymore, but they should at least offer as an option.
We have AAA, they will cover swapping a blown tire for a mounted spare. We did have a blow out in the Motorhome once. Although the mobile tire guy would have brought a tire and mounted it in place of the blown tire, AAA would not have covered it. He charged AAA $250 just to pull the blown tire and replace with mounted spare. I hate to see what it would have cost if he had to remove the blown tire and mount and balance the new tire.
-Michael