Hey, Diesel drivers, I have an '06 6.0 PSD with the tow package. Quick question - does the tow/haul switch do the same thing as turning the Pac brake on and off when descending a steep grade? I read about the Pac brake in another location and I know I don't have a switch for this. They said, if you can maintain your downhill speed with the engine braking and not using accelerator or service brakes that would be a good thing. Any thoughts on this? Thanks, david