Hyundai's official line is 'Towing with the Kona EV is not recommended' - probably due to range issues and customers complaining when they stop after 100KM.... Max towing capacity of the ICE version is 1,300Kg.
Edit - there's some talk around that the regen braking has issues when being 'pushed' by the extra weight of a trailer but that sounds like a bit of BS to me.

