You can and should fix this yourself if you own one. Spray cosmoline or fluid film on the frame. Cosmoline is perfect because you can pressure wash the dirt off but it won't disturb the cosmoline film.
At this point there is nothing to spray on, it all fell apart. It was already bad at the moment they did the recall 6 years ago with frames having fist sized holes. The way you could fix it was cutting the frame up and replacing with fresh metal plates piece by piece.
Their SUV/truck lower body panels also rust prematurely in the snow belt compared to contemporary American vehicles. This is particularly prominent on tailgates/hatches above the rear bumper when people don't diligently brush off the snow.