I can't think of any reason why Nissan, Toyota, Isuzu, Mitsubishi, etc. would have any interest in a Cummins diesel. There have been millions of smaller four cylinder diesel engines manufactured in Japan all over Asia for 40 or 50 years.
Years ago Isuzu and Mitsubishi imported small diesel powered pickups into the US market. The Isuzu was also rebadged a Chevy LUV truck and Mitsubishis were rebadged as Dodges.
And they all have their OWN diesel engines! All are used in current model forklifts too! Nissan, Toyota and Mitsubishi all make forklifts and run their own engines. TCM is another Japanese manufacturer and they run the Isuzu engine.
I do not see why Nissan would run a Cummins, but it is bound to be a hot seller, especially if it is a fuel efficient 4 cylinder.
Our company sells Doosan forklifts (who are also the parent company of Bobcat). They run a 3. 3 liter 4 cylinder Cummins made in Japan and a 2. 3 liter 4 cylinder made in Korea.