In a large dutch oven type pot, over medium-high heat, warm 1 tablespoon of oil. Cook beef and pork, seasoned with salt and pepper until pink is no longer visible, about 12 minutes. Remove with a slotted spoon to a bowl.Add pancetta to the pot and cook until golden brown, about 7 minutes. Remove with a slotted spoon to the cooked meat.Reduce the heat to medium, add onion, carrots, and celery. Cook until soft about 8 minutes. Add the remaining 1 tablespoon of oil if you feel like you need more oil but you should have plenty of grease left from cooking pancetta.Add garlic and cook for 1 minute. Add tomato paste and cook for 2 minutes. Add wine; simmer for 5 minutes. Add meats, pancetta, milk, tomatoes, bay leaves, and cheese rind. Season with salt and pepper. Bring to a simmer while breaking down tomatoes into smaller chunks.Transfer the mixture into a crockpot and cook on high, covered for 4 hours or low 6 hours.Discard bay leaves and cheese rind.