Im trying to hook up my iphone in my truck and play video onto my screen. my screen has rca inputs. is there anything i can get to hook the iphone up but still be able to charge it at the same time without having to run a power inverter? I bought a cord today at best buy that looks like this http://www.bestbuy.com/site/olspage...99&productId=1218009789158&defurl=false&h=387 but it would not work with my iphone so i returned it (i knew i wouldnt be able to charge while watching video with this one). Any suggestions?