Additional transmission cooler for 2015 with automatic transmission - INFO request

ALCON, I have read that I would most likely want to install additional cooling for my automatic transmission prior to making too many wheel/tire, gearing, etc mods. I will be operation in a relatively mountainous area with average elevation about 1200m above sea level. My question is what do I need, where can I get it (must be shipped to an APO) and who makes the best I can get? Any and all input will be gratefully appreciated!
T

2012 and up Wranglers with Automatic Transmissions show up with a separate cooler. I have a 2012 and have had no cooling problems going up steep mountain grades or hot high desert roads. The 07-11 Wranglers with Automatics used a couple of lines on the AC condenser I think.