M416B1
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The M416, the last of the military 1/4 ton trailers, can be distinguished from earlier 1/4 ton trailers by its squared fenders. There were two later versions, the M416-A1 and the M416-B1. The M416-B1 used the smaller 6.00 X 16 tires on M422 wheels because it was designed to be towed by the USMC M422 "Mighty Mite" instead of the M151 "Mutt" that towed the M416's and M416-A1's[1].
In addition to the smaller tires, the M416-B1 also had lifting rings for airborne operations and jerry can mounts on each side. Approximately 2000 M416-B1 trailers were built.