If you carry a mounted spare, it won't do you much good if it is flat when you need it.
I have seen some studies indicating that most spare tires have lost more than 75% of their inflation pressure.
Amazon has a kit.
Camping World has similar.
When we bought our first 5th Wheel, I equipped all the tires, including the spare, with the tire alarm that monitors pressure and temperature. No surprises when I needed to use the spare in the middle of New Mexico. Cheap insurance.
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