How Do I Choose the Right Cooper Tire for My Vehicle's Weight?

I'm looking to upgrade my vehicle's tires and I came across Cooper Tires which seem like a good option. However, I'm unsure of how to choose the right tire for my vehicle's weight. My truck weighs around 6,000 lbs with a fully loaded bed, so I want to make sure I get a tire that can handle the extra weight without compromising on performance and durability. Are there any Cooper Tires models specifically designed for heavy-duty vehicles like mine? What factors should I consider when making my selection?