Working on buying an 05 Titan LE with BT and Off-Road package. I have a 24' Camper that I currently tow with my Ford Expedition. Weighs about 4500lbs dry. I know when towing with the Expedition, I need to disable overdrive. Do you have to do the same with the Titan, or is that what "Tow-mode" does? Do you use "Tow-mode" and disable overdrive?