TireRack works.
However, the Escalade is built on the same platform as the Yukon, Tahoe, Suburban, and their associated pickups. Wheels from all of these should work with no issues. She might be a little ugly those months..
I grew up in the Midwest and have seen a lot of snow in my lifetime. I now live near Atlanta so not so much now.
However, if it were me and I had AWD (My Escalade does) I would just make sure I had a good all-season tire on there and call it good. We've been up in Iowa with a nasty snowstorm pulling a trailer and been just fine with the Bridgestone OEM tires.
In my lifetime, the only vehicle I worried about snow tires with was my Camaro. Everything else hasn't been an issue and I've driven 2wd trucks, compacts, large RWD vehicles, etc.
I have a friend that moved to NJ with a RWD passenger van. He was freaking out a bit (he was from CA). When we talked about it he said anything they needed to be at wasn't a problem. When it snows severely things get shut down and there is nothing to go to anyway.
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