The 2011 Dodge Charger's maximum towing capacity depends heavily on the engine and drivetrain. There wasn't a single towing capacity across all models.
You will need to check the sticker located on the driver's side doorjamb of your specific 2011 Dodge Charger. This sticker will provide the exact towing capacity for your vehicle's configuration.
Without knowing your specific Charger's engine and drivetrain, I cannot provide a definitive answer.