Check out NovaJeepers.net and there are no trails in Northern VA but plenty that make a good day trip.
Also woukd like to know where in stafford. I know of a few snall spots but most are getting blocked due to construction.Just went this weekend to the main jambo right outside of Winchester at the cove. Big Dogs off road holds a couple of events there each year. You can check their website for upcoming rides. I think the next one is in april. Its a lot of fun with any type of wheelin you want to do. I myself am searching for more places in NOVA seeing that I just got my jeep a month ago and need to take it out more. I wheel now on about 300 acres in stafford. There is lots to do from mud, to hill climbs, to busting up your whole vehicle. Just depends on what your in the mood for.
I know of great trails in NOVA. woodbridge area. anyone is welcome to join me. I go every weekend. contact me for details. me and 2 other jeeps are going out around 3 pm today.