Yeah I think Huey has a more complex design than what I'm going to do.
So yes, the goal is to get the second bike on the rear to distribute weight. The 2 design methodologies I'm looking at are:
1- Get a receiver that was designed to be drilled into or bolted to an existing unibody or frame
2- Pull off the factory "bumper" and fabricate a fully boxed bumper with a receiver hitch welded into it.
Option 2 is a bit more work, but would be more stable and both are probably similar in cost.