Hey NCRed, just realized you are only about two hours West of me. When I go into the local Lowes, there is a 20kw Generac promo right at the door. Interesting, my motorhome had a little Cummins/Onan 4kw gasoline air cooled generator and it was a very hard starter. Had to prime for a long time. Maybe a bad engineering job on the install but one would think Winnebago would know how to install a generator by now. It never died on me though. And isn't that what we want? We want them to start, and we want them to keep running. Much more than that is gravy for most of us.
Houston/HS, I always liked Westerbekes in boats. They made great generators and great small engines. Couple of zillion sailboats have them. And when folks started to realize people were dying living on or swimming around and under houseboats from carbon monoxide poisoning, Westerbeke had the engineering chops to beat the market on a low CO2 gas engine generator. I always thought they were like an American Perkins. I also had an ancient 15kw Onan diesel gen in my old boat, a heavy beast that rattled the whole boat. I often thought of replacing it with a nice compact shiny red Westerbeke, but it just never died.
Problem with all these diesel gens is that they are so much more expensive per kw. If you don't have other diesel equipment, pretty hard to make the case for them unless the application is commercial.