These are the 27m - 341 Land Rover Trailers. I got the green one in a huge collection from a friend of mine. The orange ones I got off ebay for a great price. They are the two varieties with the cast and the plastic hubs. You can see them with their respective Land Rovers here. I have also managed to acquire an orange trailer with cream hubs as seen below. I do not have a matching Land Rover for it yet.

Below is another one I got from a restorer in Edmonton. The hitch ring is broken. It should be interesting to try to repair it.