I have a similarly strange
I have a similarly strange paint problem with my 2017 Ram Longhorn 1500, although, not in as obvious of a location. On the inside of my rear bumper, on both sides of the wrap around to the rear back corner of both fenders, I have a hairline crack that basically developed vertically "just inside" the bumper overlap with the fender. Both have peeled open about a ¼" and some minor surface rust is beginning to show. I just ordered an OEM MOPAR paint chip touchup kit, I think slathering some touchup paint over each will probably do the trick and it will last as long as I own the truck - but annoying nevertheless.