2001 Trailmanor 2619 - Mold and rotted wood

[Varnado]

My husband and I just purchased a 2001 Trailmanor 2619. After we got it home, it started raining and we realized there was water leaking around some of the windows, the vents in the roof, and around the door.

We tore the wallpaper off of the wood panel on the wall behind one of the couches and it was wet and rotting. We tore down the wood panel and there was mold behind it, so we think its been leaking for quite some time now.

My husband also took off one of the vents and the boards that the vents screw into are completely rotted. There also looked to be mold in the styrofoam behind the boards.

I guess now my concern is how deep of a mold/rotted wood situation do we think we have. Could it be a bigger issue in the wood frame itself or do we think its likely just isolated to the vents, windows and door?