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Line a rimmed baking sheet with foil. Spray a wire cooling rack with cooking spray and set on top of the baking sheet.
In a large frying pan, sauté the onion, celery, bell pepper, green onion, garlic, and jalapenos in the oil until the vegetables soften, about 5 minutes.
Combine barbecue sauce, beef broth, Traeger Sweet Rub, Worcestershire sauce, chipotle chile peppers in adobo sauce, mustard, chipotle chili powder and pepper. Blend until smooth.
Remove the vegetables from the heat and stir in the blended sauce.
In a large mixing bowl, combine ground beef, pork, and spicy sausage. Add the egg, potato chip crumbs, and the cooled vegetable mixture. Mix lightly but thoroughly with your hands until well combined.
Form a rectangular loaf about 8 to 12 inches long and 1-1/2 to 2 inches high. Lay it on top of the cooling rack.
When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes).
Put the pan with the meatloaf on the grill grate and smoke for 1 hour. Increase the temperature to 325 degrees F and bake the meatloaf for 1 hour more.
Glaze: Combine ketchup, brown sugar, adobo sauce, white vinegar, and mustard in a small saucepan.
Simmer for 5 to 10 minutes. Pour the glaze evenly over the meatloaf.
Cook the meatloaf for 30 minutes or until the internal temperature in the thickest part reads 160 degrees F on an instant-read thermometer.
Let the meatloaf rest for 10 minutes before slicing and serving. Enjoy!