1. Preheat oven to 375°. Stir together ground chuck and pork in a large bowl.
2. Process diced tomatoes in a blender or food processor 5 seconds or until slightly chunky, stopping to scrape down sides as needed. Stir tomatoes, marinara sauce, and next 4 ingredients into ground beef mixture just until combined.
3. Shape into a 9- x 5-inch loaf; place meatloaf on a wire rack in an aluminum foil-lined jelly-roll pan.
4. Bake at 375° for 1 hour. Top with mozzarella cheese, and bake 15 more minutes or until center is no longer pink. Let stand 5 minutes before serving.
Note: To make ahead, prepare recipe as directed through Step 2. Shape into a 9- x 5-inch loaf, and cover with plastic wrap and aluminum foil. Freeze up to 2 months. Thaw in refrigerator 24 hours. Uncover and proceed with recipe as directed.