I'm going to look at a 2007 EL with the HD tow package tomorrow. I pulled up the window sticker and it sure does show the HD tow package as an option but also shows Class III hitch under the 'Functional' section.
So the functional portion of the window sticker is the standard equipment, if you look at the right side it says optional equipment which means that if it has the HD tow package then this supersedes the standard class III and now has a class IV hitch.
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