The boxes were redundant on the MCI Cdn M100s, since the inter-vehicle cable on the Cdn trailers were attached to the chassis wiring, as opposed to the removable one the US used. The US version had two similar plugs on each end, along with a receptacle on the trailer similar to the receptacle on the towing vehicle. When not in use the cable was stowed in the box mounted on the front of the trailer. As Hanno pointed out, these are available from John at midwest military, although you will hav to make up the two mounting brackets if they have been removed from the cargo box.
We would remove the boxes when they got damaged, or if there was a need for a similar size box somewhere in the shop. Quite often they would end up on the oxy-acet welding carts to hold the extra tips.
There was also a document box mounted on the inside of the trailer. This was almost identical to the document box mounted on the early M101 3/4 ton trailer, or the 1-1/2 ton trailers. As far as I know this document box was purely a Cdn item, and not available as a repro, but I could be wrong.
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