Hitch is on, things of note:
1. I too had to grind down heads of carriage bolts to fit through frame
2. I didn't get the wire in my hardware bag...typical for me, seems I am always short a piece
3. Used wax string and safety wire to get bolt and spacer routed through frame
4. I too had a space between frame and hitch flange/plate, getting access to torque wrench before I tighten down any further
5. Noticed the entire hitch can mount more forward or more to the rear depending on personal preference. I went more to the rear to keep stuff off my bumper. Hitch still not out past bumper.
6. I chose not to cut heat shield, the muffler is mounted with it still on there and the screws for the hitch are a bit longer, I don't see them coming loose, YMMV
7. I put my carriage bolts through the frame first, seemed easier with less stuff in the way, plus i had to deal with not having the wires for them
8. I had the back on jack stands but I think it wouldn't be hard to do flat, IMHO
9. NOw I just have to decide what rack to get. Need a 2 but with the grandkids might want to consider a 4 bike.
Hidden hitch purchased through hitchanything.com