The corner molding is not that expensive, like $14 for a 12' section but you'll pay top dollar for shipping if you can't find locally.
The rear of my trailer came a bit close to a parked car outside my house. Ended up taking the mirror of the car off with the rear corner molding of my trailer. The corner molding got pulled off and mangled up.
I could get 8' sections shipped to my house no prob by UPS but I needed a 10' piece or I'd have a seam.
Crossroads had exactly what I needed for $14 a piece. I had to pay $120 for shipping by freight due to its length.
So if it is mangled up pretty bad I'd see if your dealer can get one first. Mine could but was going to pass the shipping onto me so I bought myself. If you can reuse it you'll probably have to put the screws in new holes if they ripped out.