Can I use wall fasteners on my T@B trailer?

Here is a side view of the wall and comment from the factory:  Fiberglass - backing - block foam - backing wall paper.      We employ azdel as the backer.

To follow up on Mike's photo, here is a closeup of the walling layers.  Note that I have a 2012 T@B and they were still using thin layers of wood at the time.  That has now been changed to Azdel, which is a synthetic wood that will not rot and has become an industry standard over the last few years.

All said, they layers are about 1¼ inches thick.  I would not trust the foam core to handle any sort of weight, even with anchoring.  Anything that I have needed to solidly attach I have done so through the wood areas, such as the valences.