Sweet and Savory Slow Cooker Pulled Pork

Name: Sweet and Savory Slow Cooker Pulled Pork
Ingredients: 1 (4.5 pound) bone-in pork shoulder roast; 1 cup root beer; 2.5 tablespoons light brown sugar; 2 teaspoons kosher salt; 0.5 teaspoon ground black pepper; 1.5 teaspoons ground paprika; 0.5 teaspoon dry mustard; 0.5 teaspoon onion powder; 0.25 teaspoon garlic salt; 0.25 teaspoon celery salt; 0.25 teaspoon ground cinnamon; 0.25 teaspoon ground ginger; 0.25 teaspoon ground nutmeg; 1/3 cup balsamic vinegar; 1.5 cups root beer; 1.5 fluid ounces whiskey; 0.25 cup brown sugar; 1 tablespoon olive oil; 0.75 cup prepared barbecue sauce; 10 hamburger buns, split