I don’t think there ever was such a thing as a DU-5 as described by this American magazine in 1955 but as this was prior to official exports to the US by Nissan, they could be forgiven for having little information available to them. I believe that the model shown in this short piece is a Datsun 6147 which went on sale in Japan between 1953 and 1954. This model was very dated looking and owed much of its design and styling to the pre-war Datsun 13T of 1936.
The 6147 came as a regular pickup but this version had a double cab making it a four seater, albeit a very cramped one. I’ve also seen this body style referred to as a ‘Ranch Sedan’ by another American publication from the late 50’s, although I doubt it would have been known as that in Japan.
It’s incredible how old fashioned the Datsun looks compared to 1955 Chevy in the article above. By the time America got it’s first proper Datsun imports in 1958, this antiquated design had been superceded by the more up to date looking but short lived Datsun 120 pickup and again by the Datsun 220 which both arrived during 1955. Both still rode on what was essentially pre-war running gear. It wasn’t until the next pickup model arrived in 1961, the Datsun 320, that Nissan really had something suitable for the US market and sales took off.
The only other image I can find online of a Datsun 6147 double cab is this one shown above which is from Wikimedia Commons. It shows an example in the Motorcar Museum of Japan. However, on closer inspection, this one seems quite different from not only the double cab shown in the article but also to any other images of 6147 pickups I can find. Note the curved windscreen, front hinged doors and longer scuttle with opening side vents in it. I can’t find another Datsun model of this era with a curved screen so I’m wondering if this truck was altered at some point in it’s life.