The Loncin LC3500iO is the smallest and lightest 3000W inverter generator there is right now. And even without soundproof enclosure it's very quiet!
S15000 Diesel Generator 400V
The Pramac PX8000 generator AVR is a very complete generator with electric start, steel tank, folding handles and wheels.
ES8000 - 73 kg - 6400W - 69 dB - Generator