I have two dog crates in the back of my pick-up. One has a 4" fan with a long cord that plugs into the 12v accessory plug in the dash board, the other is another 4" fan that runs on 2-D batteries. Neither really puts out that much air movement. A buddy of mine in the club has about a 10"-12" fan that plugs into a converter which is connected to a deep cell battery. Awesome idea, and works great, but I do not want to be hauling a battery and a converter in the back of the truck. What I would like is something similar to this, but I'd like to be able to run power directly from my truck battery. Has anybody every done this? What is needed and how was it done (I'm not too smart in the electrical field so please, be detailed!).