Sorry, I haven't responded quickly.

They are around in different locations. This one was in Un-issued condition and was $1350. Others can be bought cheaper, but might need some more work to bring back to the Original appearance.
I had some small surface rust corrected, mounted the Fuel/Water can backets, and had the entire piece painted back to the OEM color. Then through the OEM contractors, I was able to get replacement parts and the reflective stickers for the body. I also replaced the tires with USGI Non Directional Tread.
It is Canadian. M101 CDN2, 1/4 Ton trailer.

There is a yahoo group for the trailer with lots of info. Also some possible areas that they may be found. Most are still in Canada, but can be found in the US as well.

They were made as a modified heavier duty version of the USGI M416 trailer, for the Jeep. The Candian M101's are for the VW Iltis.
It really does go well with the H3.