Yep, the factory tires are rated for Severe Snow Service. You can tell by the snowflake icon on the sidewall.Your truck comes with winter tires. I've run my truck through 30" of fresh snow without an issue. No, it wasn't in a field, it was on a road.
I doubt you'll face worse than that in Grand Rapids. Well, I did have one issue, the snow was being plowed up over the windshield which made it difficult to see.