We have a travel trailer and often camp where there is no power. We like to be able to cool the trailer down sometimes so bought a Honda E3000i (maybe EU300i?). In any case, it is an inverter generator which means that it runs at a speed it needs to make the power requested. It doesn't use RPMs to determine output frequency so it is not running at 3600 constantly. It is reasonably quiet, but I prefer the sound of no generators running. I'm respectful of when I run it and don't run it for long periods generally. I bought mine used on CL for half what new costs and it had low hours, wheel kit and cover. Mine fits under my bed cover if I remove the wheels, so when we are camping, I remove wheels and cable it (secure it) in the back corner of bed. When I need to run it, I open bed cover enough to expose it, run power cord from trailer and run as needed.
There are many brands that have inverter now, including Harbor Freight Predator and Champion.
The other option is the generators that run at 1800rpms. They are quieter than the ones screaming at 3600 for sure. I was thinking of a Onan RV generator that came out of a motorhome.. I think it was 6500watts, ran at 1800rpm. Looked like it had a decent muffler so maybe nice a quiet. I could put some eyebolts on it and use the tractor FEL to load it into back of pickup when I needed it for camping.. but then again, the Honda runs fine (we also use it during power outages to keep the fridges/freezers/tv/internet/etc running..