It looks like an early model from the Classic Trailer company.
I've got a 10yr old Ultralite with Forward Motion Retardation "FMR".
(it is a poor excuse for brakes - but better than nothing, that's for sure)
There have been some failures of the drawbars, but that could well be due to overloading and towing at speed and/or over rough roads on a regular basis.
Just check for stress fractures at the front edge of the box on a regular basis and get the rails plated if required.