I am about 4 hours away on the east side. If you haven't hooked up with them already the Cascade Cruisers is a toyota based 4 wheel drive club located in Tigard OR. They do several runs in the mountains around your area every year. Cruisin in the Woods is the biggest one that happens in September.
We are pretty much done wheeling in the mountains for the winter but when we start up next spring maybe we could connect. We go mostly to Rim Rock and Naches area but I want to try a trip across the Washington Back County Discovery Route. Starts just east of you and goes all the way to Canada.