Originally Posted by VinceU
Haven't used on RV but household stud finders reportedly do work with wood/alum/steel studs. Additionally you can often sight the stiffs outside as a very slight rise in the side or roof skin.
I higher end stud finder may find them but I wouldn't count on it. If the walls were built properly a stud finder can't pick out the stud with the foam being tight up against it.
When adding a tv bracket to our Sunseeker I tried every trick in the book that I have learned from 20 years of construction and still couldn't find them. I marked out a section where the tv was going and uses a very small finish nail and had to keep tapping it through the wall until I hit metal.