Both Bridgestone and Continental have documents describing the effect of under-inflation on the life of a tyre:
Nitralife Nitrogen Generators are portable and can be mounted on a trailer or service vehicle.
Nitrogen Generators are 100% pneumatic. No electricity needed
Extended tyre life. Tyres running at the correct temperature and correct pressure will not only be safer but will last longer
Fewer tyre failures and improved retreadability. Unoxidised rubber casings remain flexible and are less susceptible to impact fractures and tyre failures. Nitrogen casings can also be retreaded more times
Tyres maintain pressure better. Nitrogen is the slowest migrating gas through a tyre. Tyres running at the correct pressure flex less, run cooler and last longer
No oxidation of the inner liner. Nitrogen tyre casings remain stronger and more flexible. Nitrogen tyres will hold pressure better throughout the life of the tyre