Just brought a new Chev Silvarado 1500 with 20" Goodyear Eagle tires. When doing a little research on the tires, which I wish I had done before buying the truck, found out they're passenger car tires....
I had te same concerns with my Avalanche. I went with 285/60r20 Nitto Terra Grapplers. Great tires no matter what the weather. I went to the local Discount Tire and explained my concerns, the Manager did the research and discounted the tires cause I am a loyal customer