Perhaps he means the M101CDN2 (Iltis trailer). While the time lines don't overlap with the M38A1, they are the toughest version of the M-series 1/4 ton trailer yet. I have both the M101CDN2 and the M100. It is the M101Cdn2 that I use all the time.
In the event you are talking about a M100 1/4 ton traielr, then you will be wanting one made in Winnipeg by Motor Coach Industries in either late 52 or in 1953. Best place to find those is to look on kijiji....they come up from time to time as do the M101CDN2.
https://www.kijiji.ca/b-canada/l0
There is currently a half dozen of the M101Cdn2 trailer presently listed on kijiji. Even with the weak Cdn dollar, they are priced from high to obscene.
https://www.kijiji.ca/b-canada/m101-...r/k0l0?dc=true
And here is the one lone M100 presently listed for sale:
https://www.kijiji.ca/v-cargo-utilit...ationFlag=true
I bought 27 of the M101CDN2 trailers off the DND back in the day. I sold a half dozen to a friend in the salvage business who still has some for sale. I don't think his prices are as obscene as kijiji, so if you want to shoot me a PM I can give you his contact information.