I have e-mailed most of the sites asking for trail maps. I think private clubs are unlikely to send them, but if they don't want them published I'm not really comfortable posting them anyway. So I asked and will see what happens. Demon Hill sent me one already.
The TrailPass ones I need help with are: Tin TeePee Family Campground (who I suspect may not offer ATV riding anymore as they are listed as a TrailPass site but are no longer listed on TrailPass), Pine Hill ATV Park, Mount Kenyan Trail, and Camden Trail. If you have any of those you could send over to me, it would be greatly appreciated. I'd be happy to credit you or link you or anything that may be helpful.