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I drive less than 5k miles per year as I work from home. So your 3-4 years and worn out tires would need to last me 10 years or more. LOTS more time to corrode from the inside. So for $10 per tire I get lifetime N2 fill for the tires, the benefits that are known fact of more even air pressure cold to hot and slower leakage, and the potential benefit of the tire not going bad on the inside. A dollar a year, two cents a week. Yeah, I guess I HUGELY wasted money on this.

Well, I'll continue to do what I want to do and those of you making snarky comments can do as you please.

I went today ~1.5 mi from home and got N2 put into my tires. $10 per wheel and covered for the life of the tires. Bridgestones, so they should be good for a while. When they (generically, not sure what this place used to charge) were charging $25 per tire it and 14 miles from home it was more iffy to be worth it. The benefits are real. It's worth it to me. YMMV

Air is 78% nitrogen. Tires filled with nitrogen, from a reputable source with proper equipment, are ~99% nitrogen. Big deal. So what. Oh, yeah, far drier than regular air so the tire compound and the wheel material are less contaminated and deteriorate far more slowly from within. Oh, yeah, larger molecules so seeping out through the tire is much slower meaning pressures stay up properly much longer. Oh, yeah, more temperature stable so the fluctuation in tire pressure from cold to hot is less keeping the tire closer to optimum pressure at all times. But yeah, big deal, so what. YMMV.

I am not a tire guy, nor do I play one on TV, but I'd think pickups might wear a little more toward the front, especially if driven with no load in the back. Heavy engine and cab up front, sailboat fuel out back. But I don't know anything except chicken fried steak is almost always a good idea.