newb with a DRW/SRW question

mettech wrote:
http://www.ford.com/resources/ford/general/pdf/towingguides/14_superdutypu_sep11.pdf

Standard Trailer Sway Control
– Single-rear-wheel (SRW) models –
Trailer Sway Control works with
AdvanceTrac® with RSC® (Roll Stability
Control™) 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..?

If you read, they have a "similar yaw motion sensor", so the dually does need sway control. It's probably just a cost issue. Since probably 90% of the 250/350 trucks are SRW, they could justify the cost of developing a better system for those trucks. The duals may not work right with the name branded system, so they applied a simpler system to the more rare dually trucks. Result is you probably are more suseptable to sway in the dually (not that either is likely to have an issue on a properly set up truck).

Also, sway control is typically related to a bumper pull. Having driven both a 5th wheel and bumper pull plenty, sway is not even comparable. Also the extra width will do nothing for sway.

The extra width impacts roll overs in the context of this discussion with the real reason for using duals being the extra payload capacity of 4 vs 2 tires.