Yeah, that chart seems to have an agenda.

Personally, I don't think an additional cooler is necessary. Air moving across the radiator and the engine coolant thermostat working with the transmission fluid thermostat works pretty well to keep temperatures in check.

You tow. Maybe you need a separate cooler. What temperature does your transmission fluid run at when your towing?

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim