Add the 1 cup of beef stock to a microwave-safe liquid measuring cup and heat on high for one minute in the microwave. Sprinkle the 1 packet of unflavored gelatin evenly over the top. Stir to combine.
Place the 2 slices of bread in a food processor and pulse until it is the texture of breadcrumbs. Transfer to a large mixing bowl.
Add the 1 small onion, 1 small carrot, and 1 stalk celery to the food processor and pulse until the vegetables are finely chopped.
Heat the 2 tablespoons olive oil in a large non-stick skillet over medium heat. Add the vegetable mixture and saute for about 5 minutes until the vegetables have softened. Stir in the beef stock and simmer until it has reduced by half. (about 10 minutes) Add the vegetable mixture to the breadcrumbs and allow them to cool for 10 minutes.
Add the 1 lb ground pork, 1 lb ground sirloin, 2 eggs, ¼ cup ketchup, 1 tablespoon Worcestershire sauce, 1 teaspoon dried thyme, 1 teaspoon dried sage, 1 teaspoon dried parsley, 1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon smoked paprika, ½ teaspoon ground black pepper, and ½ teaspoon kosher salt to the bowl.
Using your hands or a large spoon, mix gently until all of the ingredients are evenly combined.
Lay a long sheet of heavy-duty aluminum foil on the counter. Form the meat mixture into the shape of a log on top of the foil. Try to keep the size of the log consistent so that the meatloaf cooks evenly.
Use the 1 lb of thin-sliced bacon to create a bacon weave. For more information on how to weave bacon see the above post. Place the bacon weave on top of the meatloaf and tuck the ends underneath.
Wrap the meatloaf tightly in the aluminum foil with the seam on top. Poke 10 holes in the underside with a knife or metal skewer to allow the grease to drain out.
Set the Traeger grill to Smoke, and leave the lid open for 4-5 minutes until the fire is established. Set the temperature to 250°F (120°C) and preheat with the lid closed for 10 to 15 minutes.
Smoke the meatloaf for 45 minutes.
Open the foil and fold the sides back creating a shallow pan. Use a spoon to distribute the glaze across the meatloaf and then use a silicone brush to smooth the glaze out. Being careful to not contaminate the glaze with the undercooked meat.
Insert the probe of a thermometer into the center of the meatloaf. Increase the temperature to 325°F (165°C). Continue cooking until the internal temperature reaches 150°F (65°C).
Remove the meatloaf from the heat, tent with foil, and allow it to rest for 20 minutes before slicing. While it rests the meatloaf will continue to cook eventually reaching an internal temperature of 165°F (75°C).
Slice with a serrated knife and top slices with the remaining glaze before serving.