Nitrogen will not support spontaneous combustion/explosion in your tires. That's its only benefit. Large airplanes use nitrogen for that reason. There were several airline and military airplane accidents back in the early 1960s caused by in-flight tire explosions after the landing gear was retracted, usually caused by an overheated brake that had dragged during taxi and takeoff. After Boeing did some research, they recommended a switch to nitrogen.
If your RV can do 140 mph for two miles or so with a dragging brake. maybe nitrogen would be a good idea. Otherwise, it's a waste of money.
Frank and Eileen
No longer RVers or FR owners