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 -