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I wouldn't worry too much about the whiplash with a hitch. Not sure how much those bumpers would help either. Might even make things worse especially given they stick out some, so may cause more damage if the rear impact isn't that great. The bumper will take most of the impact on low speed hits, but if that thing is there then the impact may start with the hitch bumper, cascade to the hitch receiver, then to the frame where it's bolted before the car that rear ends you even touches the bumper.
Regardless of whoever rear ends you, they are not going to have a good day when that hitch bumper goes through their radiator and engine block.
It's really odd that BMW with all their engineers can't figure out how to make the kick to open feature work with the OEM hitch.
I opted for the OEM hitch because I have the kick to open feature on two of our cars (XC90 and X3), but have never really used it except for maybe a handful of times...pun intended.
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