I photographed this Bantam T3 Trailer at the Western Antique Aeroplane and Automobile Museum (WAAAM) in Hood River, Oregon. The Bantam T3 is very similar to the M100 Cargo Trailer.
Bantam T3 Trailer
WAAAM, Hood River 2021
WAAAM, Hood River 2023
Bantam T3 Trailer
I classify this as a Bantam because it is almost identical to the WAAAM example, which was clearly marked as a Bantam Trailer. However I think that the number of tiedowns may lead these to being better as M-100 Trailers.
The M100 has no tailgate, 4 side tie-downs, and a pintle hitch, while the Bantam T3-C typically features a useful rear tailgate, 3 side tie-downs, and often a ball hitch.