If you have an ipod, then it doesnt matter because then you can get the ipod interface that hooks thru the back even if there was a "ipod input" in the front. the interface allows you to play your ipod thru your stereo AND it charges it for you, all thru the same plug... unlike if you had a ipod port in the front (or back) and would have to have both the input and charger hooked up to it.
I found this for you, its $59.00. It says it works for 2007 rams. I dont know if there is any other cables you have to buy, but it looks like its all there. http://www.installer.com/item/display_item.php?it=pxp01
if you have another type of MP3 player, then you will still have to go thru the back, no big deal, it takes 10 minutes to do, but you wont be able to charge it without a seperate car charger.