It just bolts straight into the same mounts as the old one.
View attachment 47011
The rear bumper bar and the 2 legs that are connected to the chassis on my expanda look similar to yours if not slightly heavier steel on mine.
i have been told that the factory bar on my 18.1 (2016) is not strong enough to carry a towball hitch / bike rack and will experience a severe bounce.
I have been advised that I need to reinforce the rear bar. I would be interested in your thoughts.
this is my van below.....