Upgrade your BMW X4M rack package to also have towing capability. Simply add a wiring harness, “zero play” ball mount and safety chain anchors to your existing hitch. You will then be able to use your detachable rack receiver for bike racks and cargo carriers or the detachable ball mount for towing. No reconstruction of the existing hitch is needed. The latch block requires remounting as we use longer bolts to capture the safety chain anchors.
To install your BMW's "zero play" ball mount simply unlatch and remove your rack receiver and then attach your ball mount to the same latch block.
Stealth's Towing Conversion Kit for the BMW X4 M40i contains:
Safety Chain Anchors
SHR31019 2016-2018 BMW X4 M40i