While a feel a Cummins engine is a good piece of equipment and a true Cummins generator is also good what you're looking at is not a Cummins.
I used to install the permanent mount air cooled automatic starting residential generators from Cummins; they came in 13kW and 20 kW sizes. The 20 kW used a Kohler engine, the 13 kW used a Subaru engine. Both units had lots of problems with quality control and electrical components. I finally quit putting them in and wouldn't recommend one.
The larger liquid cooled Cummins units were actually made by Cummins even though they used a Mitsubishi engine in the LP/Natural gas units.
I highly doubt Cummins had anything to do with a portable generator other than putting their name on the side.
