http://www.ford.com/resources/ford/general/pdf/towingguides/14_superdutypu_sep11.pdfStandard Trailer Sway Control
– Single-rear-wheel (SRW) models –
Trailer Sway Control works with
AdvanceTrac® with RSC® (Roll Stability
Controlâ„¢) using a yaw motion sensor
to monitor the motions of the truck
to detect trailer sway. When sway is
detected, the system works to apply
selected brakes and/or reduce engine
power to help the driver regain control(7)
– Dual-rear-wheel (DRW) models
are not equipped with AdvanceTrac®,
but operate with a similar yaw motion
sensor to detect and control trailer sway
and apply brake pressure selectively to
the front brakes or reduce engine power
to help the driver maintain control."
There must be a reason that the DRW does not need the AdvanceTrac system..?