Chinook CH-47
Without looking too far into it, I believe that the GPH rating is either a typo or a mistake.
1.2 GPH would seem much closer in my estimation.
According to what was posted up thread it is a Tritium Veevil 50 KW charger.
Spec sheet does not give generator engine details, only required input.
Standing by my estimate of 1.2 GPH
https://tritiumcharging.com/wp-content/uploads/2020/11/TRI93.DTA_.001_Veefil-RT50-TRI93-50-01-Specifications.pdf