As a general rule, Thor Motor Coach does not bury wiring inside the laminate walls or ceiling to allow servicing. They often use double wall in cabinets to span points of use. The obvious exception is for ceiling lights, where a channel is cut in the block foam core and wire installed before the (heat, pressure, and vacuum) lamination
This is why there are no outlets or switches mounted within the walls like with other brands.
The interior wallboard is a structure of the multi-layer laminate and is not easily removed without damage to the structure.
For running circuits, you might obtain a wire tracker like:
https://www.harborfreight.com/cable-tracker-94181.html
Works like a charm
Best luck