Good luck to those of you that feel you do not need WD on larger, heavier rigs. I sincerely wish you the best and hope you do not find yourself in any situations where the WD hitch could have saved your bacon.
Take a look at the second paragraph of
this post by member Sundance for one good reason to use it.
I personally have experienced a similar situation a couple of times and am very thankful I was using a WD hitch. In addition, you might take a gander at
this post I made a couple of years ago during our trip home from Florida.
As far as the GM pickups goes, it has only been in the past year or so that they changed their recommendations for using WD and that applies only to current vehicles - no their older ones.
Barney