How do I get my mail forwarded to me from my Traveling Mailbox if I don't have an address?

In this case, we recommend using the local post office where you are located to have your items received as General Delivery via the USPS. You will be able to request items to be forwarded from your Traveling Mailbox to the local post office where you are located.

Here is more information: https://faq.usps.com/s/article/What-is-General-Delivery