If you're driving with a full trailer and there's a chance that something might fall out - then it's a good idea to use a trailer net. Trailer nets ensure that your load stays in your trailer and doesn't endanger you or other drivers on the road.
They very easy to set up. Use a trailer net when you're driving with furniture, rubbish or other cargo.
Forzaline makes qualitative trailer nets in 13 different sizes with difference in width and length. Here you can find a trailer net for most trailer models on the market. The elastic cord on the net is meant to be pulled around the round buttons mounted on the sides of the trailer.