How do you know it is a jeep trail. If it is a two tracker that doesn't qualify it to be a jeep trail. It the trail isn't posted with white or yellow signs, the trail has no number on it, ride it, providing it isn't a hiking, biking, or horse trail.
if it looks like its been graded, stay off. Jeep trails are generally OK
Not necessarly true, there are roads that are numbered but not graded.