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This subject I do know about. After 31 yrs of racing, and working with tires to the 1/4lb. it is very critical. Nitrogen does make your tires run considerably cooler. When tires run cooler, they do not grow in size, which is critical in racing. This means if you ran nitrogen in your trailer tires it would help with the heat these tires get going down the highway on the very hot days. As I stated when tires get hot they grow in size, and stretch the tires etc. Stretching the radial tires on a trailer isn't good at all. But... and this goes along with what others say. It would be a benefit if you could run it all the time, but we can't, out on the road, unless of course you had a big tank you carried with you which is not practical. Once you start to mix air in with the nitrogen all benefits of nitrogen are lost.
I hope I explained this well, I tried.
Dave
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