Bill,
Our Chevy has just over 20,000 miles on it and the OEM shocks are not doing what they should be. There are some situations where we get too much side to side movement, not necessarily sway.
I think that the loads we put in the bed of our trucks just overwhelm the shocks. Most of us have increased spring capacity so OEM shocks are unable to control this greater energy- that isn't what the engineers designed for. They were looking to control their designed load while hitting a $ point.
On a previous truck I changed to Rancho 9000 shocks front and rear. Big difference in handling with the TC loaded.
BUT
As you can imagine our salty winter roads were very hard on the adjustable shock. In a couple years when I traded the truck in the adjuster was rusted solid.
New shocks are planned for next spring, but they won't be OEM or externally adjustable.
John