Thanks
In U.K. We don't fit the us style hitches, instead we fit a removable swan neck

This leave (in most cases) invisibility after removal, after bumper removal a cut is required on the underside

Removal & replacement of bumper crash frame & wiring to loom
The square US receivers are seldom used for private vehicles, the westfalia detachable bar (OEM to BMW & most other German manufacturers) is good for 3500kgs & a nose weight of 150kgs, though lesser on most other manufacturer of bar.
BMW recommend installing a further radiator with the towing package.....