How much would YOU like to know Chaplain? I can assist...
Mrmag1, the trailer that the Chaplain pictured is an Marine M322 EET (Engineer Equipment Trailer). They were used to haul backhoes and all-terrain forklifts behind the MTVR in the Marine Engineering units. As far as military trailers go, there were not many of them made because: 1. they were a Marine specific trailer and 2. they were an Engineer Division specific trailer. They were made by 3 different manufacturers in order as follows: Holden, Terex/Load King and Globe. The trailer pictured is a Holden and is one of the earliest versions, possiby even a prototype. I say this because the air lift lugs on the deck are above the deck where later versions had them recessed in the deck with covers. There are a few other differences I also see. Trailers will weigh around 11-12k, with a load capacity of 20k. The government contract price was between $30-40k per trailer. When I asked Holden what it would cost to build the same trailer in today's market I was given a $50-60k range if the same quantity was ordered. The Holden rep I've been speaking with for the last year oversaw the majority of the testing at Aberdeen Proving Grounds.
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Directly in front of the APC in the original picture are the air lift lugs above deck level. The picture below is of the recessed and most common design. Just showing the difference here and why I know that's a very early version.
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Each manufacturer used a specific model number for their trailer but they all fall under the M322 designation. I have a Holden MTO20A1 model that I've been "cleaning up".
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Simp has a Terex/LoadKing model and uses it exclusively in his travels. They are very well built and designed trailers. He hauled my trailer down from NH on his trailer. Feel free to ask if you want more info.