Is there any documentation of the variances of m416 trailers by different manufacturers or by different dates and modifications? The trailer i just picked up had tow large brackets on the frame sides, before the spring mount. My old m416 did not have them and i have googled and have not seen any other frames with the brackets. It is not added on by a previous owner, it looks to have been on the frame from the beginning. I am thinking it might be a mount for Jerry cans, i have seen a few pictures of trailers with fuel cans right in this general location. Another difference i noticed is the rims on the trailer have larger round holes compared to other wheels where they are much smaller. I thought the m416 shared the same rims as the MUTT, but i never noticed differnce wheel patterns. Do I just have a later trailer? The data plate is pretty much sanded flat and i have no information about manufacture.