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A couple of urban myths I can see here, firstly running too cold mainly effects petrol motors coz the NOT (normal operating temp) is set to help atomise the fuel so the motor runs at its optimum unlike a diesel. The other is the tubes of a quality 2 core and 3 core sould be the same diameter meaning a 3 core is thicker than a 2 core radiator. The theory I have been told by a manufacturer is its is easier and faster to cool a small quantity or water rather than a large mainly coz of the core thickness which affects airflow thru the heat sink of the core. As a recommendation a 3 core radiator would be better suited for heavy towing on the freeway coz the the travel speed will aid in cooling the core.
This is what I was told and from my experience made sense to me with my experience but doesn't make it gospel either, your driving conditions will dictate which size core suits your application as I told you the other day Jonathan
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