Hi, I have a 2009 Titan 4X4 XE, and I tow a Puma 19FS. I live in the Coal Regions of Pa, and there are a lot of hills. I put the tow haul mode on and shift into 4th. I have never had any problems with the truck doing it this way. I got the information on doing this on the " Club Titan " Forum
Nissan Titan Forum lots of good Titan advise.
Mac