We just got a 2004 4x4 with AT. There were no options for additional engine oil and trans coolers for towing. We'll end up doing some light towing but it will be 10 hrs in 90+ degree weather and some in hills/mountains. After some break-in period I'll change everything to synthetics which will help a tiny bit. What towing experience do others have regarding need for or addition of extra oil coolers for the engine or trans? Thanks for the help.