I do not believe there is that much damage. I believe a good RV body shop can fix that fair easy. I have seen lot worse then that and they have fixed them.
I do not believe the vertical stringers would be damaged through out the house part of the coach.
Freightliner is only the chassis part and the vertical stringers would be Fleetwood. But it would take a roll over in my opinion for the stringers to get damaged. The impact was in the front driver side and that is where most of the damage is. Front cap, fender and some side body fiber glass repairs.