Montana requires every wheel to have brakes on trailers with a GVW of 3,000 lb or more. The brake system must work for 15 minutes after the trailer goes AWOL. However, those trailers don't require chains!Yes they do. I have seen them for sale in Missouri, but in Illinois we are required for all axles to have brakes.
I enjoy these trailer discussions since they get me thinking, they force me to do some research and I end up more informed. I have a bit of a trailer obsession in that I have five including two dump trailers, an equipment trailer, an aluminum utility trailer and a rolling chassis from a camper.