These cars can tow very easily, the additional equipment on towing cars is a separate ATF cooler which fits in the right side of the bumper along with a duct and a cooling fan triggered by a 100C switch in the ATF cooler lines.

Almost all european E300D estate wagons had them by default.

I'll try to find the capacity rating.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)