The Wally Byam Caravan Club International has a number of national caravans planned for 2017 and 2018. They are affordable adventures. Lengths vary from three weeks to two months. Details for the caravans may change as caravan leaders finish their plans. For more details check the following websites.
Websites of Interest
The NorCal Airstream Club is the Wally Byam Caravan Club International (WBCCI) chapter in Northern California.