Hi, i just purchased one of these for our camper last year. The np75d generator engines are made by shibaura out of japan. 954cc, 3 cyl, 1800rpm. They are also licensed to perkins (do not know their model number) and an updated 2018 version from caterpillar (slightly bigger displacement at 1.1L. (C1.1). generac 09344-1.
99 DSDP 3865 Cat 300, 06 Acura TL via dolly