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One way to see the framing is look at motorhome on a morning with heavy condensation. The frame is where the condensation isn't. Of course, this doesn't work with wood framing nor very well if the coach is aluminum skinned.
I have a stud finder that will detect both wood and metal. It will also detect 120 volt ac in the wall. I highly recommend this type of sensor. Of course, to detect the ac, you need to be plugged into shore power.
Electronic Stud Finders work on the principal of "changing densities" / The difference between hollow spaces and spaces with something inside the wall. It doesn't care if it's a wood or metal stud. It only knows that the space is filled by something. It will also detect metal or plastic pipes and some wires.