It is fairly easy to get a spare tire. I went by TownFair Tire and they had to see the coach to make sure they got the right wheel but had it for me in a few days. The whole thing was less than $200. Mounting it is a bit of an issue. With your coach you could probably use a hitch mounted carrier. Others have mounted it underneath just in front of the bumper. I mounted mine to the ladder which has worked well.
Just having the tire and wheel on hand is 75% of the battle because then you don't have to wait for a tire/tow facility to find you the right tire if it is blown. But with the right equipment: jack, jack stand, 1/2" breaker bar and socket, you can do it yourself in a pinch.
One additional point about the water heater. If you are not getting enough flow from the shower head to keep the heating element on, remove the shower head. There is a little white button with three small holes in the fitting where the head screws on. Remove it and throw it away and you will get plenty of flow.
David
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