Sydwayz-
Thanks bro! It looks like Putnam makes a 15,000# hitch for the '03 Ram. I may call them to see if it mounts in the existing space or below the stock hitch. Although you have to jack the bed up in order to get the stock hitch off, it would be worth it to have a hitch mounted in the stock space......

It looks like they only make 2" solid ball mounts rated at 10,000#'s. That doesn't make sense when your hitch is rated at 15,000#'s and you have a ball rated for 20,000#'s????
It might be overkill, but I'd rather be safe than sorry!
Chad