I have a 2022 Blazer AWD 2LT. It needs new tires. The stock tires are 235/60R18 on I believe 8" wide rims.

I'd like to go to 265/60R18. Almost the same diameter, just a little wider and they should mount on 8" wide rims.

any comments, suggestions, advice?

I'd be running Falken Wildpeak AT4.

 

I have no direct experience with the newer CUV style Blazers but I highly doubt those tires would fit without rubbing or other problems. According to the tire calculator I prefer, the 265/60/18 is 1.2" wider and close to 1.5" taller diameter. That's 4.87% taller, which leads to all sorts of challenges.

Check it out on 1010tires.com

The crossover type vehicles don't leave a lot of extra space for larger tires. I'd suggest you look for a size that's less than 3% different, and ideally 1.5% different or less than factory specs.