Does a truck's load affect its braking distance?

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I still don't believe it's as clear-cut as “loaded truck = longer to stop”. There at many factors at play, there are many road conditions, and there are many trucks.

For example, what if the road is very muddy or very snowy? I’d venture to say that a truck which is too light will be more prone to hydroplaning or sliding.

Even in ideal conditions, it’s not a reach to say that the truck could be designed to perform better with a load than without one. The suspension settings or brake bias could be set up to provide better grip when loaded.