More useful is the tow / haul mode, which alters shift patterns based on the extra weight of a trailer. (cnet.com)
The nose weight of the trailer (the weight applied to the hitch) is also very important and on cars - medium trucks usually shouldn't exceed 50 - 200 kg (mechanics.stackexchange.com)
Thanks to the NV's stellar 9,400 - lb tow rating, the additional weight of the trailer was barely noticeable and didn't affect our travel time. (automobilemag.com)