I'm in California, near San Francisco. If we do organize something, I say we go to Hollister Hills where the Top Truck Challenge is held! There's a staging area we can reserve and the wheeling is great from pre-novice to triple black diamond trails (especially in the winter when every trail becomes 5x harder), and it's sunny most of the time even in the winter. I think that what we need is someone to set a date and then see how many people can commit to it.