Engine/transmission braking in gas engines

My first tow/haul option was on a 2005 F350 diesel that I pulled a big Montana all over the country with. I had previously owned a 2002 F350D without tow/haul. I found it to be a very handy convenience going across the Rockies and even on some of the much shorter but still steep grades on the Blue Ridge. It also comes in handy when exiting an Interstate exit ramp. I am happy to have it on my 2012 gasser too. On long down grades one tap = one gear. The really steep grades usually take two taps and then I seldom have to use the brakes. Its a good system and very easy to use without having to use the shift lever. You can focus on the road ahead without distraction.