If a trailer is pulled in the woods and no one knows did it really get towed? Legally is another matter and legal towing is a matter of if you get caught through any collisions, traffic violations, liability issues... you are screwed (not covered and personally liable). If its a full size Bronco I would look again on the door sticker as they are rated 3,340 to 4,500 lbs depending on model. I once took a deep dive into what gives any given vehicle its tow rating; sometimes its mechanical limitations (GCVWR, Engine, Brakes, way hitch mounts...) other times its the manufacturer not wanting to deal with the risk warrantying it, pay the fees, do the testing or product positioning against other models...