If you have a fiberglass exterior wall, there are no real studs like in a house. There is nothing but styrofoam in the wall. There are metal supports at various places in the sidewall. Like where interior walls or overhead cabinets are screwed to the outside wall. You will not find studs on 12/16/18 inch centers at all. METAL exterior RV walls you will have studs. We do not install the type you want but my customers that did drilled holes thru the wall and installed a backer plate on the inside wall with bolts. UGLY, but it works. Make SURE you seal the outside plate and screws/bolts correctly or rain water WILL penetrate and delam the wall. If under factory warranty, installing this type exterior bracket will void your sidewall warranty. Doug