What Material Is Used To Make The RV Interior Wall? With the number of people moving into RVs to travel full-time, it’s little wonder that you might want to decorate or paint your RV interior walls just like home. You might also be curious if you can hang things like photos or wallpaper on your RV interior walls. All of this probably has you asking: What are RV interior walls made of? RV walls are made out of 1 of 3 materials – plywood, medium density fiberboard (MDF), or vinyl.