Chevy states that a WDH is optional even with a 18,000 lb. trailer load. With a 12,000 lb. trailer load I have never needed a WDH with my 2011 truck and its frame.
"In almost every case (where the United States has fought wars) our overwhelming commitment to freedom, democracy and human rights has required us to support those regimes that would deny freedom, democracy and human rights to their own people." - Gore Vidal