Sorry - disagree - Just looked at one, the bumper could never support class IV weights. The 06 I looked at had the same class IV hitch as my 04, bolted directly to the frame and hugs the underside of the bumper! The bumper is setup for a lower class tow!

Heres what is in the tow package for more then 5,000lbs
Includes Class IV trailer hitch receiver, 7-pin wiring harness, heavy-duty 72-amp battery, upgraded radiator and upgraded auxiliary transmission oil cooler (requires 4.6L or 5.4L Triton® V8); auxiliary transmission oil cooler only with 4.2L V6 A/T

Dealers will not pull off vehicles with them already installed, because there is to much to pull off!