SOOOO many factors. These tests are on a track usually. When you drive you have thousands of parameters like surface type, coarse, smooth, asphalt, concrete, temperature, debris on the road, moisture, the list is endless. Also each TYPE and SIZE of tire will handle different which each set of parameters. No one tire will win all different parameters. The Timberline in some occasions will brake better than the Stealth and vice versa. Way too many factors to digest.
Bottom line is its a 5500 lb vehicle and more with passengers, fuel and cargo. You have to drive it different. Changing tires and stuff to make it possibly brake better is a waste of time as there is only so much you can achieve AND all the parameters for different conditions/surfaces may negate your expense.