Absolutely. I like to set it in tow haul straight away, 4A for wet pavement, and 2A for dry so far seems to work good. Lock gears to 7 max (both towing and normal day to day use), might allow it to run up to 10th during those hour-long straight stretches of i5).Don’t be afraid to use tow/haul mode, manually lock out gears, and downshift for yourself as needed.
As any Billy Big Rigger worth his salt will tell you, your gearing is your first set of brakes. The service brakes are secondary.
On my way down from Stevens pass I kept it in 3rd around 4K-ish RPM which kept my speed real steady and manageable as it was coming down a roughly 7% icy grade and for the most part prevented me from touching my brakes.
The one thing I worry about is having the trailer whip around on my as I decelerate, I try to be as smooth as humanly possible with all of my inputs (good practice for the track too!) but I just don't know the limits of this setup and am doing my best to stay well within them.
One thing I've found curious is why tow-haul doesn't firm up the suspension into 'Sport' level or full stiff?
When I was hauling the trailer empty and being bounced around like crazy, setting to sport mode made a dramatic difference, albeit with too jarring of shifts.
Full stiff suspension + buttery shifts with extra engine braking would be a great combo as far as I can tell.