Apologies Ed for using the term "Iltis" trailer, I am merely pointing out the fact that terminologies for all these trailers is used loosely.
I think most people know what a M100 trailer is....
For us "civvies", military jargon and nomenclature is often lost when discussing various materiel.
As to Duane's query, any trailer stipulated as a 1/4T has a payload of 500lbs.
For the M170, a 1/4T trailer is plenty to haul down the highway.