As I've posted other places, unless your rig can go 170 mph with a dragging brake, nitrogen won't do a thing except empty your billfold.
The airlines use nitrogen in airplane tires because thay CAN go 170 mph with a dragging brake. When at Boeing, I was involved in certifying a landing gear layout where the retracted tires came very clos to a pressure bulkhead. I did a lot of research on in-flight tire bursts. Most were a result of combustible gases being released by the tire into the inflation volume followed by spontaneous combustion and a blow out. Nitrogen is used to inhibit the risk of explosion.
One 727 incident resulted in the stranded wire in the tire bead failing in tension. We calculated that the explosion pressure had to be up around 12,000 psi to cause that failure. That incident punched a 15" hole in the pressure bulkhead of the aft cargo compartment. It was only the jamming of a couple of USPS mailbags in the hole that prevented a probable loss of the airplane.
Frank and Eileen
No longer RVers or FR owners