They did the same thing to my 05 to fix the bed plate leak. It seems extreme, but it didnt take the tech long to get the cab off the truck. I was pretty impressed.
Ford has 2 TSB's for this problem. If you have a 2 piece driveshaft the carrier bearing needs shimmed, if a 1 piece driveshaft there are a couple of options with the rear blocks. This is really common on Crew cab shortbeds.