Yes. From what I have learned the Curt 13329 (class 3), the Curt 12171 (class 2), and the DrawTite 36600 (Class 2) all need some modification to have them sit a bit higher, sit up against the frame of the car, and sit level. I think I prefer to have the hitch, DrawTite, sitting higher into the fascia than risk having it scrap the asphalt over a speed bump or something.I just installed the 36600 and I'm going to have to take it off and modify it. The receiver tube sits at a significant downward angle. https://www.etrailer.com/Trailer-Hitch/Draw-Tite/36600.html You can see on that page there's a review showing the installed hitch and you can see the angle. The rear mounting bolt holes on the hitch need to be slightly higher than they are in order for it to angle correctly. I'm going to try to correct mine this weekend, but might have to find a fabrication shop to fill and redrill the hole for me.
Sorry to hear you have to modify. I looking at the DrawTite or the Curt 12171 but will go to a shop to have them mount it for me. Just trying to get educated so I know what to ask for when I finally get the job done.