Getting out of this valley I use the 2nd setting I have not found a reason to go above that. I can tell you I'm not the last one out of the valley. My 16K lb 5er pulls just fine. I would think about adding a trailer brake to help save on the truck brakes if the trailer is equip.

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Winger
2008 2500 Silver 4x4 6 Speed Auto Big Horn Edition Volant CAI Magnaflow Muff Edge w/ Attitude
1990 Honda GL 1500 Wineberry 125,000 Miles
2005 Honda GL 1800 Candy Blackcherry 50,000 Miles