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I also use my tow haul mode when towing. Honestly, if something happens to your truck when towing and it is under warranty, they may void the warranty if you weren't using tow/haul mode. As Lloyd said it holds your gears longer. It will use more fuel so some do not like to use it but I would rather pay the difference in fuel than in potential engine/tranny damage.
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2014 Chevy Silverado 3500 Duramax SRW 
2014 Palomino Sabre 34REQS
2011 Crossroads Zinger 26BL --sold
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