If you want to hang decor inside your RV, the best place to secure a nail or screw is at any of the trim strips over the seams of the paneling or where you see nail holes or staples. You'll find a wood stud underneath these strips or nails in the wall panel that provides the most robust support for your decorations. Trying to hang items on the paneling between studs will lead to failure, as the thin wall panels aren't strong enough to hold things secure with continual RV movements. Another issue is accidentally nailing or screwing into water or electrical lines running between the studs. Many RVers swear by Command hooks or similar removable-adhesive plastic hangers to display items wherever they want. However, you do need to match the hook rating to the weight of the decor piece. Read the label for weight ratings to find a good match. Follow hook installation instructions carefully, as most require cleaning the area with alcohol and letting the hook set for 24 hours before hanging decor. Expect things to fall off your RV walls if you rush the process.