My 2015 Ram has the integrated trailer brake controller and it work really well. I've had 2 aftermarket controllers in two previous trucks and the integrated unit beats either of them hands down. Smooth operation, trouble free, and reliable.
When the scratches are light, you can try a scratch remover. Currently, I am using Carfidant Scratch and Swirl Remover. It works great for me.
But if they are deep, scratch remover will not be able to remove them. Then you need to-
clean the scratching area
use a scratch repair kit
apply...