I am also a member of Cal4Wheel by default, my club is a member. I actually was a member of cal4Wheel before I was with the Spinnin' Fours. This is the association that fights to keep our trails open, everyone involved in 4x4's should join. The more membership they can show the more power they will have with our elected officials. Clubs also join as a group so if you plan on joining a club see if they are a member, the club will collect your membership when annual dues are due.
The website:
http://cal4wheel.com/The bulletin board:
http://cal4wheel.com/phpbb2/index.php?sid=313b457e312f0037c03a32c608b7ece9Membership information:
http://cal4wheel.com/member/member.html