The 2.5 automatic Outback has a towing limit in Europe of 1,800kg for a braked trailer - that's 3,969 lb in old money. Although the towbars are different between US and Europe, there aren't any other mechanical differences.
I tow a 1,250kg single-axle caravan (2,756 lb travel trailer) which handles fine cruising at 60 and not phased by overtakling at 70+. This is despite the low European noseweight limit of 82 kg (182 lb).
I don't understand why the idea of 2,700 lbs behind an Outback is even questioned.