If it was my truck, I'd ram it's 8 YEAR OLD rusted body right through the freakin dealerships window!!

Seriously though, take it to the service department at your local Ford and demand they fix it - under warranty. They should have had AT least an 8 year warranty against rust PERFORATION. Are you the first owner? It's best if you are.
If the service writer balks - go to the manager - then say you want to speak to the GD owner.
You may get a deal on the work (pro-rated warranty) at the very least.