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Possibly a variant of the M416??
http://g503.com/forums/viewtopic.php?f=18&t=98995&start=15
jeepdraw.com/TM_9-2330-251-14.pdf
...or M716....http://bantamt3c.com/images/hubbard/Pages/Bantam5.html
...or M762....http://www.militaryjeepers.com/community/showthread.php?30197-M762-Trailer