A few years ago I lived in San Diego and did many trail runs with a group call "Just Runs"
This is basically a 4WD vehicle club but their philosophy is basically no membership dues, no meetings, no politics. The only time they meet up is to well, go on trail runs. They have some rules such as vehicle requirements, CB radio, safety gear, 2 speed t-case. Basically a vehicle off road worthy.
This philosophy works great for them, they average 5 runs a month. I always was able to find some one to go out on the trail with or find a group to join on the weekend, often times last minute. For people that live in the Southern California area it is a great "forum" to lead or join trail runs. Granted this was in Southern California with millions and millions of people in a relatively small area.
I emailed the person who started Just Runs and asked how they would feel about some one starting a Just Runs Colorado. I believe they did trade mark Just Runs, so I explained if they did not want their name being used I would not use it and come up with my own name that followed the same philosophy. But I am really hoping to create a sister site to them.
So would anybody be interested?? I am not trying to make money, I just miss having a group like this. Please check out their website and see what you think. If I think there is enough interest I will get it setup up.