First, I have learned a HUGE lesson ----> do NOT poke holes in your RV walls if you can avoid it, Why? the walls are thin, the walls are filled with wiring and plumbing that you don't want to mess with. For example: I bought a corkboard to hang up papers and such at horse shows. It had two little hanger hooks that came with it including 1" nails. I pounded them in at an angle by the side door, up by the cab area, voila, holes through the fiberglass poking out the front. So, here are some better means of hanging stuff or keeping things in place and the varying success I have had with them.
- tacky putty - not much success, limited application
- velcro - don't like the adhesive on the back of it
- 3M Removable Interlocking Fasteners With CommandTM Adhesive - liked this method of adhering and hanging the best
- suction cups - limited applications but happy with it so far
tacky putty - I bought this for hanging very light things, such as a matter picture and for keeping light things in place, such as my ring holder in the bathroom. this worked ok for the bathroom application, it does not work for vertical applications. My guess is that the temperature changes of the walls and the weight is too much for the putty to hold.
velcro - I haven't had good luck with velcro, mainly due to its sticky back adhesive. the previous owners of my RV had used a long wide strip of velcro to keep their throw rug in place. of course that rug came with it so as soon as I got home I went to pull it up and found that the gummy is permanenty adhered to the linoleum. I will need to purchase some acetone to fix the problem, likely permanently dulling the linoleum in the process. So I stay away from Velcro.
3M Removable Interlocking Fasteners With CommandTM Adhesive and Hooks with CommandTM adhesive - Ok now with this adhesive I have had the best luck. the new velcro with the little balls fitting into the hooks and 3M's fancy removable adhesive are great. This stuff works well for vertical applications. I have successfully hung: bath towel hook on the door, magazine racks(using 3 of the interlocking strips), framed pictures, hooks for hats, keys etc. I even put up a hook and removed it to prove it was removable. I have had these in the RV for almost a year now. What I like best about them is that I can take the pictures and shelves off the walls for safe travel, and put everything up when I make camp, ensuring my RV is "homey" just the way I like it.

3m Command strips for my paper stash

3m Command strips for my horses win photos!

3M Removable Interlocking Fasteners With Command Adhesive
suction cups - I found some bath accessories that looked RV friendly, they have suction cups to adhere to the mirror. I bought a toothbrush and misc holder to keep stuff in. Since RV baths are small, its nice to keep the tiny counter space clear. Again after about a year these items are still doing their job nicely.