Moving the event down to California sounds fun, but I think it may exclude some of the participants from Washington. There are a lot of wheeler's in the central part of WA, and Seattle that make the 6 hr trip to TSF. I don't know how many would be willing to add extra hours to that
I would not be opposed to the Naches Trail, funny rocks area. There is ton or room, it is central located and there are developed areas (water restrooms etc.)with little to no fee required.
The trail system is larger and varies from very technical trails all the away down to beginner with a stock vehicle. You can go from running mud, to difficult rocks, then right on over to a easy trail ride.
I will volunteer myself for whatever is needed most, from a camp host all the way to trail guide. if the event is held close I can count on at least two more mature adults as well.
They hold the NAXJA meet up there yearly and there's plenty of room and fun for all.