Article 145 of Bahrain's Traffic Law Implementing Regulation governs a private car towing a caravan trailer. What does it require?

1. The trailer may have any number of axles provided the total length stays under 20 metres
2. No more than two axles, dimensions not exceeding 5.5 m long, 2.5 m wide and 4 m high from ground level, a combined car-and-trailer length not exceeding 12 metres, and two braking systems on the trailer
3. A caravan may not be towed by a private car under any circumstances
4. Only the trailer's weight is regulated; its dimensions are unrestricted