Practice question Is it allowed to tow a trailer without a registration plate? Yes, if the trailer is under 750 kgYes, if the trip is shorter than 50 kmNoYes, if the tractor plate is repeated on a handwritten card Answer: C — No The correct answer is shown above. Try the full quiz for additional practice. Practice more: Bulgaria Theory Test E Practice Questions - Bulgaria Category E Driving Licence Theory Test (Trailer CE-DE) Exam →