I have a new 24' enclosed trailer and I'm looking for any and all opinions for mounting a tire rack inside. Below are a few pictures of my tire racks. If I screw into the wall beams, will I need additional support in the middle, or will a wall beam on each end be enough? It's just long enough to hit a beam on each end.

It sure would suck if the thing tore out from the wall and bounced around inside until I stop to unload.

http://a8.cpimg.com/image/A0/BA/14933408-1...0-02000180-.jpg
http://a8.cpimg.com/image/AA/BB/14933418-3...2-02000180-.jpg