I have a 2002 Itasca 34D. At the WIT, a steel fence post jumped up while I was backing and did mess up the same corner as yours. The the parts dept found a new replacement for less than $300. Seems like they had just got a shipment into stock. It was unpainted. I have not matched the paint or installed yet.
As I walked out of parts dept , one of the folks said I should be able to fix my damaged one, but I decided to keep the new one. Never know when another fence post will jump up, eh?
2002 Itasca Sunrise 34D, Allison 1000, 8.1 GM