How should you transport cargo in a trailer pulled by a passenger car?

In the photo, you are driving along a high-speed dual carriageway behind a dark passenger car pulling a trailer with a tall navy-blue tarpaulin. The load in a trailer pulled by a passenger car must not affect the stability of the vehicle - answer C. A load that is not secured (A) or that covers the trailer's lights (B) is prohibited.

The Road Traffic Act states that a load is placed on a vehicle so that it does not cause the permitted axle loads to be exceeded, does not affect the stability of the vehicle, does not make steering difficult and does not limit visibility or cover lights, signalling devices, registration plates and other plates or signs; the load must also be secured against changing position. Stability is the ability of the combination to drive straight and behave steadily on a bend and when braking. A tall, heavy load placed behind the trailer's axle takes load off the tow hitch and means that at higher speed, for example on a high-speed road like the one in the photo, the trailer starts to sway from side to side until it throws the whole combination off the road. That is why you load heavy items low, above the axle or slightly in front of it, so that there is a few dozen kilograms of load on the hitch, and you fasten light and tall items with straps.

Legal basis: Art. 61 para. 2 and 3 of the Road Traffic Act (Prawo o ruchu drogowym)