Randy- 6" lift and 35" tires.
This truck replaces a 2011 that was exactly the same height... The 2011 towed my 24k # fifth wheel TH just fine all over the Sierra and Rocky Mt's. It also towed my 24k (GVWR) gooseneck flatbed just fine, and my stock trailer and my LQ horse trailer. No difference in how/where my headlights pointed when towing. However, my trailer axles sit under the spring pack (not inside of it) and it has good size G rated tires so it rides a little higher than most.
As a side note- there is no softer lifted suspension. It uses the same spring pack the truck comes off the showroom floor with.
Good thoughts and I appreciate the feedback/concern but misplaced.