Nitrogen in tires
I used to pressurize the landing gear struts on airplanes with nitrogen for all the reasons mentioned, but the main reason was so moisture in the strut would not freeze at high altitudes or on the ground. Also, these struts used an "air and oil" mixture. Oil and even a small amount of oxygen under pressure can be an explosive combination. We got the nitrogen from our welding gas supplier in a high pressure tank and then regulated it. The struts reuired a pretty high pressure, depending on the plane. I think tires and wheels on land based vehicles get plenty of wear and tear from the exterior and filling the tires with nitrogen is overkill. But to each his own.
Bill
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