I have a MasterTow dolly and have towed my car every year in excess of 10 years. I do carry a set of magnetic lights for emergencies. Once was when I blew a dolly tire and tore a complete fender off which shorted out all the lights on the dolly. Your car should have reflectors in the taillights which will make it visible. On a large class "A" the MH the tail lights are above the towed vehicle normally. Carry a set of the magnetic lights for emergencies but ensure you check the dolly lights each time you load the toad.