Purchasing a hitch for your 2021 Hyundai Kona EV such as the Draw-Tite # DT52GR Class 3 hitch will indeed include all necessary installation hardware and printed instructions, which I've linked for you. view full answer...
Yes, the Curt Trailer Hitch Receiver # C11529 comes with the fishwire needed to install this on your 2018 Hyundai Kona. I have attached a picture of the included hardware for you to reference.
If you let me know what you will be using this trailer hitch for I can make additional recommendations as necessary. view full answer...