I just did this about a month ago. I installed a 2" hitch from Torklift Central:
https://torkliftcentral.com/2013-2020-nissan-leaf-ecohitch
Thre install was fairly straightforward, followed along YouTube video:
https://youtu.be/lAjL9gXMBlk
Finally, I picked up the RockyMounts SplitRail LS 2"...