Snow Chains on Trailers???
The main reason for at least one tire chain on a trailer is to keep it from drifting/sliding/slipping on snow, ice, mud.
We have had at least two sets of tire chains on our rig since we have been fulltiming now for over 15 years. Back in the past I drove in the Wyoming oilfields hauling oil and produced water from oil wells and oil rigs. It was muddy, and icy, and then there was the Snow....... We had Tire Chains running on our trucks more than thay where off. Tire chains are cheep insurance to help you in bad spots when the weather catches a person off guard. I've actually used Tire Chains more to get our rig out of a slick, muddy spot then in the snow. They work great when stuck off road and you need more traction to get unstuck. It won't save you if you are up to your axles, but on slick surfaces like mud and wet grass it will save the cost of a tow truck $$$$$.
If you do get a set for your rig make sure thay are the correct size and you know how to put them on properly. Also keep in practice and put a chain on once a year so you don't forget and to make sure the chains are in good working order.