Greenthumb

We have a 2013 Springdale RV trailer and recently found rot after pulling up the floor. We think the seals broke on the roof so plan to reseal. The wood frame is completely rotten beyond repair. We assume this roof corner has been leaking for a while. Maybe years. Wondering how big of a job this is to replace the wood frame or if this thing is basically junk now. For context, this is the back floor corner where bunk beds would normally be. They’ve been removed. Help and thanks!