Bratmanstudio, HI! Sounds like y'all found the right unit for your family. I hope everything is up to expectation and y'all have many enjoyable trips.
As for N2 in tires, I agree with SuperD. The only reason I had it in some tires I have is because Costco uses it when you get new tires there. Pressures don't fluctuate much with temp, but unless you have an N2 bottle handy, your topping of with air.
Just my $.02
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