In a situation like this, we can offer up somethings to help THEM keep OUR roads open.
1. Suggest an expansion of their Adopt-a-Trail program, where locals take on the maintenance and erosion control work, under their guidelines and even supervision.
2. Become their work force when they say they can't do it -- put up their signs; pack out trash for them; be the manpower.
3. Perhaps find some way to limit use during the times of year when most trail damage is done; yet keep the road open the rest of the year unitil more measures can be implemented to make all the trails year-round routes.
4. Heck, before a closure, suggest limiting the number of rigs on a trail system, or a (don't shoot me) permit system so those who do go are doing it right and not doing damage.
5. Volunteer for work projects to fix specific problems. Put together a team of workers and just get it done (for them).
6. Help them find grant money to keep your trails open (such as the RTP program that BlueRibbon Coalition worked so hard to get for us, using federal highway tax money).
7. Volunteer to staff up information stations (kiosk, trail entry points, whatever), and handout brochures or home made flyers that talk about how to do it right for the area in concern.
Form a COALITION for the areas in question, or a FRIENDS group. Something like Friends of GA Trails.
More on how to form an informal coalition here at http://www.delalbright.com/Articles/coalitions.htm