Earlier this year after much looking around I decided to try and fit a rack and crate to the back of the Super73 S2. I've had a few questions about what I've used to get this working. Here's a short video showing what was used, how and some of the challenges. Equipment used is as follows:

Generies Universal Bike Rack: https://amzn.to/32oNIes
Basil MIK carrier plate: https://amzn.to/3Em8bh8
Basil MIK Adapter plate: https://amzn.to/3FkInDr
Basil Crate Small: https://amzn.to/33JS3tf

Enjoy,

Matt