1. Heat oven to 350. Heat oil in large skillet over medium heat until hot. Add onion, bell pepper, celery and garlic; cook 5 minutes or until softened. Place in large bowl, cool to room temperature.
2. Whisk eggs into onion mixutre. Stir in breadcrumbs, parsley, 1/4 cup of the barbecue sauce, Worchestershire sauce, Cajun seasoning and salt. Add ground beef and pork; mix togehter by hand or with large fork until just blended. Add sausage; mix until thoroughly incorporated. Shape into compact oval loat (approximatley 10 X 5 1/2 Inches), place in a shallow baking pan.
3. Bake 30 minutes. Brush with 2 tablespoons of the barbecue sauce; bake 15 minutes. Brush with remaining 2 tablespoons barbecue sauce; bake 15 to 20 minutes or until meat loaf is firm and juices run clear. Loosely cover with foil; let stand 15 minutes before slicing.