How thick is the back wall of a Class A? For mounting TV?

Just pulled my paneling off the side walls in the rear bedroom on my 95 gulfstream. The studs on my particular unit are welded steel, but do not run horizontal or vertical, but diagonal vertically about every 24 inches..
I'd be sure to use a stud finder and trace out the wall with pencil before committing to a location.
I see there isn't much "to code" type of building going on in a lot of RVs, they all differ drastically.
a quick phone call to the manufacturer may help.