Add all of the ingredients to a slow cooker and stir until combined.
1 pound ground beef, 8 slices bacon, 1 15-ounce can baked beans (or pork & beans), 1 15-ounce can pinto beans, 1 15-ounce can light red kidney beans, 1 15-ounce can butter beans, 1 8-ounce can tomato sauce, 1 cup diced onion, 1 cup brown sugar, 1/2 cup sugar, 1/2 cup ketchup, 1/4 cup barbecue sauce, 2 tablespoons vinegar