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I suspect that most bumper armatures removed to fit a towbar DON'T get given to the owner - I also suspect that many tow cars traded in with the towbar still on, get it removed by the dealer and spend the rest of their life with no armature!
On my X3 BMW to fit the towbar they had to leave out a plastic composite honeycomb looking object from behind the bumper. Didn't worry me the towbar looked far stronger to me! When I sold it just left the towbar on.