The V8 I looked at yesterday had a 2 inch receiver class III. The stock V6 I saw had a 1-1/4 inch class II receiver. The receivers are welded in as part of the frame.
The option is there to have a class III or IV installed depending on the engine size which dictates the towing capacity. YOu have to pay extra for the larger hitch.
XLT & Limited both come with CLass II standard, the smaller hitch. The Class III/IV is a $150 option on either model. For $150, for sure get the larger hitch. You never know when you might need it.......