If you RV uses a truck size tire just call road service. They will have them in stock and they have the pneumatic tools to change it. I can see carrying a smaller spare for a car or TT but when you get to a certain size, it's better to let the pro's deal with it.
Unless it's an odd size or not a common tire, I would not worry about it.
So few people can actually or will change a tire these days that most cars only have a doughnut and only a select few actually have a full size spare. I don't think I've changed a tire in over 20 years.