This trailer was the standard 1 ton trailer used by the US army in WW2, it is commonly known as the Ben Hur type but they were just one of several manufacterers who made them.
They came in all steel or wooden versions and caried general stores as well as generators and fuel.
(The trailer that used to come with the Airfix H/track is this type of trailer.)
Ideal for towing behind a Dodge Weapons Carrier, GMC 6×6 or Half Track.
The tilt is a separate piece and can be left off.