Been there done that.
Last year I clipped the neighbors mirror while pulling into my drive with the trailer. Broke his mirror off, pulled off the corner molding like yours and made a fist sized dent in the aluminum.
$2500 worth of damage according to the adjuster. No damage other than superficial wounds. Took the money and paid that much off of the camper and replaced the corner moulding myself.
The moulding was $12 a piece for a 12' section. But since it was so long I had to have it shipped freight which was $120.
Here's an album of the fix. There's still a dent but it isn't bad.
Album link
