I'm still dithering on a new truck for my daughter. An SLT/LTZ 1500 with max trailer, 8 speed (8L90E) and 3.42 gears costs about the same as a 2500/3500 similarly equipped with the 6.0L and 6L90E 6 speed & 4.10 gears. Because of the terrain, either going uphill or downhill, cylinder deactivation...