Originally Posted by Jim Bennett
This is what the 2009 Manual says.
Weight Distributing Hitches
A weight distributing hitch is not
recommended for use with your
vehicle, as an improperly adjusted
weight distributing hitch may reduce
handling, stability, and braking
The 2014 manual has exactly the same statement. 2009 through 2015 models years are the previous (second) generation, so it makes sense that they would all have the same towing information. Given the 4500 pound trailer weight limit, I assume that Trav is asking about this generation.
2016 is the first year of a new (third) generation of Pilot; the weight limits are raised and the WD statement has changed.