Thanks for the comments!

I'll have to see about removing the rear bumper cover to take some photos of the hitch mounting points. If I had to guess, I would say that the hitch most likely mounts like the DrawTite aftermarket hitches to the rear subframe bumper mounts.

The portion of the hitch that goes under the car towards the differential is welded to the rear subframe instead of bolting to a rear crossmember like the DrawTite hitch.

The installer did use an OEM 7-pin connector, harness, and electronic module which they interfaced with the external trailer brake controller and added LED trailer light compatibility.

I'm all set to pick up the U-Haul trailer tomorrow to practice driving and backing. Then I'll let you know how it tows the travel trailer in a couple of weeks.