My 1974 Challenger is in the process of being restored.
I came up with an idea to make a hitch that is hidden. The friend that is doing the bodywork helped me acheive a rather novel approach to having a hidden hitch on a challenger.
I had some heavy plate steel bent in a very large press in a manner to mimmick the lines of the rear cross member where the bumper is bolted to the rear frame rails.
I had a second plate bent to fit behind the cross member that when combined, sandwiches the factory crossmember.
A receiver tube was welded to a heavy plate and to the first outer cross member plate. It is then bolted to the inner cross member plate that sandwiches the factory cross member.
Longer and higher grade bolts go through the bumper brackets the plates and cross member. Thick washers and nylock nuts will retain the basic sandwich hitch. Additional bolts add stiffness in a few more places.
The hitch is accessed through a hole in the rear valance under the license plate. The license plate, is held by an upside down hung spring type b body license plate holder that is used to access the gas filler tube.
I don't have pictures, and there will be a few custom pieces required to work the safety chains, but I believe the prototype will work.