I have a receiver type hitch complete with mounting hardware and lighting harness (worth $40 itself). In excellent condition. Fits 2017 - 2021 model years. Local pickup only. (I might be able to meet you within 25 miles for another $20)
Blue Wood Gas Road surface Electric blue

Bumper Wood Automotive exterior Material property Automotive tire

Here are the details on the wiring harness:
Automotive lighting Electrical wiring Cable Audio equipment Wire

You might need to replace the wire clamps since mine were used once. They're the 4 little blue items in the pic on Amazon. If you want to power it directly from the Bolt's 12V battery you'll also need wire and an inline 15A fuse/holder: