If you need larger than a 10,000 watt generator buy a diesel one. Kubota make’s the best ones we know. I’ve been selling them for 25 years. We don’t stock them but we work closely with S.E Kubota the largest Zkubota in the S.E. United Ststes. They rarely have problems and those have usually been caused by the buyers themselves.
For any diesel generator over 300 kW, I don’t know which are the best nowadays, but I will do my best to try and find out what and who to recommend in the local area, and I will let you know.