If items are light to medium weight use 3M Command strips. Clean all surfaces with alcohol & if you think 2 strips will hold use 4. We've had all sorts of items on the walls for 4 1/2 years now & never had anything fall & NO holes left behind. I don't leave the pull tabs exposed as recommended, usually cut them off, & when I need to remove an item I use a plastic putty knife & gently work it off the wall.
I found screws DON'T hold in the thin wall paneling when bouncing own the highway, but the strips DO.
Danny & Linda