The Continental CrossContact LX Sport tires that came with the Blazer was the only thing I didn't like. After only 24k miles the tires are down to the tread wear indicators, and was told that I needed new tires already. Tires were rotated at each oil change every 5k miles, and most of my driving is on the highway here in CT. My Blazer 2LT has a different size and I went with the Cooper Evolution H/T (235/65R18) tires. For your Blazer RS, I would recommend the Yokohama Geolandar X-CV which are all terrain 50k tires. The Yokohama was my second choice when I had to replace mine this February.