I found a video for the brake controller. It is on a 2009 but being the same generation I am sure there is not much difference. It seems the murano does not have the cabling needed so it has to be installed.
http://www.etrailer.com/tv-install-teko ... 39510.aspx
Now, lets move on to the transmission cooler. I have found a few references.
Some say it is not needed and if installed will void the warranty of the CVT transmission which I am not really worried about anyway as I can put it all back in a heart bit and they will never know....
Some say it is needed....
I did call a nissan dealer and over the phone they did told me it was needed and transfer me to sales to get a quote but got disconnected.... As far as I am concerned, it is needed, so I am still looking for those that has done this so I can get a little of background.