If you want to send something to Rosie and Ben, the next major mail/rest stop for them is Aqua Dulce, California, which is a suburb of Santa Clarita. The address is:
c/o The Saufleys
11861 Darling Road
Santa Clarita, CA 91390-5406
To make sure you don't miss them, send it "Priority Mail" and have it there by May 20th and use the 9-digit zip code for faster delivery time.
We'll keep you updated on their mail drops.