I like my Champion 3000. Got it got about $300. These things are much quieter than the old portable gennies, though not as quiet as an inverter gen. It's about as quiet as a 10 year old built-in.
You can't hear it inside the trailer if the air is running. And I have the option of rolling it out further from my trailer. Since it's on wheels with a handle, it's perfect for a toy hauler. Just roll it out the ramp. For $300 it's pretty much expendable. You only use for air, microwave or to charge batteries. The TV will run on 12v and fridg runs on gas.
I keep it at home for back-up if I ever need it.