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We begin with the nicely restored 1940/41 G-527 water trailer, also known as the “Water buffalo”. Like its cousin the 2 wheel cargo trailer with a 1-ton payload, the G-527 could carry 250 Gallons. It was pulled by a variety of vehicles such as the Dodge series WC, and other vehicles rated ​3⁄4-ton and upwards, some well-known vehicles such as ​1 1⁄2-ton 4x4 trucks, and ​2 1⁄2-ton 6x6 trucks, such as the Chevrolet G506 and the much-used GMC CCKW trucks.


Several companies built the trailers for the Army, but the most noted is the Ben-Hur-Mfg, Co, hence the name of the cargo trailer being called the “Ben Hur”. The G-527 can be found in the TM 9-883 and is listed in the Group G series List of U.S. military vehicles by (Ordnance) supply catalog designation. Group G series numbers were designated to represent "Tank / Automotive materiel".

Specifications of the basic trailer are -
 

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Henri says that the first edition of the tank, 1940 – 1941 is made of aluminum, after 1941 onwards the tank was manufactured from 14 gauge steel. Also at this time was the first edition of the hitch weld. The pump on the front is for loading the water through a 25-foot hose with a bell strainer at the bottom of the hose.

The axle is produced by Renault and frame welded in France, the rubber meets the road with GMC wheels.