There are bound to be some people on here in that area. The Cheatham State Wildlife Management area is near Ashland City and I know there are trails through it. I haven't ridden it yet, but I know it is there and people ride there. Hope you find someone who knows where a trail head is located...then tell us! lol
It used to be a nice ride. I was there years ago. The trail head we used was on down Sam's Creek I think. I also used to like to ride the rails to trails up here. It isn't very long. Only about 10 miles from end to end.
I live in Ashland City and would like to see if we could ride together sometime. If you would e-mail me at firstname.lastname@example.org maybe we could talk about it. I have been to lots of places so know where to ride. Look forward to hearing from you.