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A welder or fabricator could make up four corner brackets/adaptors that slide down into the corner posts of the trailer and could be through bolted or welded in place on the trailer. Don't forget that the cage will add weight to your unbraked trailer, thus potentially reducing load capacity. The unbraked trailer capscity is limited to 750kg and that includes the weight of the trailer. Also those thin slipper springs will struggle with much weight. You can buy stronger slipper springs from Supercheap or a trailer parts outlet, and they usually fit the more modern slipper spring channels on box trailers. I replaced both springs on my unbraked box trailer and it made it more load carrying capable without adding more than a kilo or two to the weight - the replacement springs are rated to 900kg (as a pair). If your getting a welder in to make an adaptor for the cage i'd be getting him to put on some new slipper spring box section to give you a stronger rear slide section.
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