Just checked under my rear bumper and guess what! There was a removable cover! Has a plastic slotted screw, I removed it and noticed a wire harness with pins sticking out of it toward the left side of the opening, no other things observable. The bumper does not look like the tubular design shown in post #25, but from what I could see, seems like it may be the stock bumper shown in post #26. It does have 2 threaded holes toward the center of the opening on the bottom of the bumper. I've got Signature # S00847 Aren't signatures supposed to came with all the options? Wonder why this one didn't get the towing option. Seems to have everything else except that. So looks like the bumper will have to be replaced. What's the cost everyone is seeing for that?