"USE OF JEEP 4X4 OFF OF DESIGNATED ROAD"
This phrase really interests me, it's a new one. If you were all street licensed (SOS) vehicles and it is passible by a conventional 2wd vehicle, you are legal. If you were not street legal, you would have needed to be on a marked route. To me, you were not on a trail that required 4wd nor were you creating an errosive condition. Those are the 2 stipulations that would get you. Next, was it posted closed or bermed in any way? Was this state land or NFS? What type of officer wrote the ticket?
IMO, you should fight this ticket. Please contact AND LISTEN to Trail Fanatic. He should be able to give you some guidance.