nationwide vehicle locator

I am aware of the vehicle locator service through ford's website http://www.forddirect.fordvehicles.com/SuperDutyIncoming.jsp?target=Inventory&sModel=2005superduty&sBrand=Ford&partner=fv&sZip=

But, this allows you only to search by a zipcode. Does anybody know if you can plug in a particular vehicle with options wanted and do a nationwide search of ford dealers to see if they have a superduty that matches your criteria or if there is another search engine on the web that will allow you to do this? I cross-posted this in FTE forum also.