We don't even want those places mentioned on GATR. :-)
I'll share what I've shared with many newbs:
For a place to be legal to wheel, it has to be an offroad park, a designated public road of some type, your property, or you need written permission in hand. Just because there are no signs does not mean it is open to the public.
When it is a road, you must stay on the road, including forest service roads. The ditches and mud puddles and climbs off to the sides are not the road, so they are illegal wheeling, destructive, and an eyesore to the community.
Most of what goes on there does not follow "Tread Lightly" rules. Much of what goes on there is not on the road, but off to the side of the road.
GATR supports Tread Lightly. treadlightly.org.