I did a search on line for a USGI 1/4 ton trailer and was finding project stories all over the place.
Apparently, the US one's were all made back in the 60's for the Jeep series, and have been used to trail behind all types of Military vehicles hence forth. Needless to say, the surplused pieces are real beat up, and have been completely restored by those who bought project trailers and had the time, money, and expertise to re-build them.

The problem is they have been rebuilt for the person who did the rebuilding! So they are very hard to come by in any decent condition.

So through my searches, I find that the Canadians also developed a trailer based on the US version and made some Modifications to Beef it up!
It was designed to be used with their Jeep equivalent, the Volks Wagon Iltis.

This group of trailers were made by DEW Manufacturing, in Ottowa, I believe.

There were 2000 units made in 1992, and never got put into service.
I bought mine from a guy in Colorado who obtained 60, that were shipped stacked three tall on skids. I bought one of the last three he had. There was a little surface rust so I had it stripped and prepped, then Re-Painted in OEM OD Green, and will reapply the decals that were removed for the job.

From time to time they pop up on eBay, and under searches, but IMO these are going to be the last of the Military 1/4 ton Trailers.
Since some of the H3 Components are made in Canada, I think the M101 CDN2 trailer makes a nice compliment.

Here is the website for the Colorado dealer. HTH
http://www.coldwarremarketing.com/