If it is laminated wall, you don't really have studs. The manufacturer laminates mounting plates into the wall where things are to be mounted.
If an interior wall (not inside of an exterior wall)! you can sandwich a larger section of the wall with plates of heavier material, like plywood or 1/8" aluminum, and bolt through the sandwich. Even so, with enough load, there is a risk of the wall failing around the edges of the sandwich.
We tend to think in terms of house construction, since we use these RVs like houses, but they are really more similar to corrogated boxes, lightweigth walls getting strength from bond of skin to the core, the core in this case being foam insulating board and the skin usually a very thin wood veneer or composite sheet. Where there is no mounting plate laminated in place of insulation, there is nothing in the wall to hold a fastener.