I don't have the schematics for the framing for that particular model, but, I believe, that all the FunFinderX series have the welded 1" square aluminum framing. There is no "wood" involved in the exterior walls, with the exception of the spare tire mounting, that is between those studs. Usually you can spot where the studs run by looking at the cabinet mounting areas...not the outside edge of the cabinets, but, on the inside of the cabinet you should see a "flange" that the company screws into those studs for mounting.
If you look at the "new" 139 series, you can see where they mounted the swivel arm for the LCD television swing mount on the stud just inside the outside edge of the counter over the refrigerator...