Another option for attaching things to the walls...they are very thin and the aluminum framing is usually already covered by cabinet mounting points...Command Strips.
I started out with their usual assortment of hooks and then I was looking for a good way to put up the toilet paper holder
Then it hit me; you can buy the Command Adhesive strip refills (the sticky part, minus the hook).
They come small, medium and large. A couple of those attached the mounting plates to the wall, the toilet paper holder to the mounting plates. Haven't budged in 2 1/2 years. Now I use them for virtually everything I need to hang on the trailers walls. They (3M) even have new version that is similar to Velcro, but, utilizes round knobs that interlock and I use them for anything that needs to go on the wall (or even a flat surface) that you need to take down periodically. They were designed for picture frames, but, serve just as well for the battery clock, the indoor / outdoor thermometer, the King Control SureLock meter, etc.
If I decide I don't like where I hung it (anything), they remove simply and cleanly with no damage to the wall or counter top (I use the picture hangers to mount the little rack the drink coasters sits in to the counter along with the DVD player).
Amazing stuff and you are only limited by your imagination as to what you can hang / mount / attach things to.