dont the 2015s come with heavy duty radiators? Regardless of whether you have the tow package?
I dont recall where they made the switch.
Earlier models had 2 radiators--- the heavy duty- and the regular.
Then they went to 1 radiator regardless of whether you had the tow kit or not.
If you already have the HD unit... I personally would not add an external cooler. It would simply introduce another point of failure in the trans cooling system.
Now if youre towing a huge trailer-- maybe.
2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
2003 Trailblazer 4.2L- 181,500