Put your truck in T/H and let it buck. The truck knows what to do. I’m towing in 6th most of the time. There’s no problem with it, it’s quieter and better mileage.
Also, don’t use manual mode when towing, it disables automatic grade braking.
2012 CCLB 3500HD Z71 Appearance Package Dmax/Alli
275/70-18 Cooper ST Maxx - Air Lift Bags - Viair Onboard Air - B&W Turnover Ball
Wishing it sounded like my old LB7 with Banks exhaust. . . . . . .
MY FUELLY PAGE LINK
1984 C20 6.2 J Code TH400