From the FAQ:
Q: How do I get my motorcycle back home after the ride?
A: We hope you choose to ride home, but if you’re pressed for time you can ship your bike for roughly $800 coast to coast. After registering and sending in your SCMR2020 deposit you’ll receive a welcome packet with heaps of event information including motorcycle shipping information. We’ve partnered with MotorcycleShippers.com and they are offering our SCMR2020 participants discount pricing. The process is quite simple. You can get a quote now at https://motorcycleshippers.com/book-quote and then book the order online. There is a section for notes in their order form where you can enter SCMR2020 and they’ll apply the discount when you book your bike shipment.
For what it’s worth, some overseas riders on past events have even bought and sold motorcycles at the beginning and the end of their trips!