I have a 2017 Nissan Frontier SV. The paint on the fenders in front of the back tires is chipping really bad. I have gotten several opinions of the issue and most everyone says that is from rocks.I did have a bodyshop owner look at it too, and in his opinion he stated that he believed it was the too high to be soley rocks. However, I have looked at older models 2005-2018 with higher mileage than mine and the paint in the exact spot is not even a 1/4 bad as mine. Therefore I do not believe it is rocks, but the paint job itself. I have attached some photos and my truck has 25K miles.
I first noticed the paint chipping at approximately 5K miles.