I'm getting worried about the unofficial forum "new tires" rule. i.e. buying new tires will result in you buying a new RV/vehicle in the near future.
A couple of months ago we spent several weeks in southern CA. Before leaving, I put new tires on the coach. While in southern CA, we looked at various new/used coaches, but survived the emotional grab, and came home.
When we got home, I put new tires on the Suburban (our toad). It (the Burb) works great when the expanded family is aboard, so no plans to replace it.
Last week I put new tires on Chris' Lexus; The third set of tires on a car with less than 40,000 miles on the odometer.
This week I took my Lexus in to have wheels balanced and tires rotated. Turns out there's a misalignment in the front end that caused some tire wear on the inside of the front tires, and the rear tires were cracked. I didn't screw around, and had them put new tires on. The upside was that their inventory was 'wrong', and they gave me their top-of-the-line tires for the mid-line price I was quoted.
We tend to keep our vehicles forever, and have no plans to replace any of them. OTOH if we come up on the lottery, we might reconsider