The Honda EU2000 is the benchmark for smallish, quiet, generators. 2000 watts won't power a house, or even a roof AC on a motorhome/trailer, but it's quiet, darn quiet.

They can be bought online/mail order for about $880 shipped, Honda won't let folks advertise prices so you have to shop a bit.

RV.net is great place to read about generators. Someone there has just about everything you can buy. Lots of folks that have tried to quiet the big loud stuff too. There are cheap Chinese knock-offs too, I'd like to think you get what pay for, there's arguments both ways.

(Scored mine while Ebay/Paypal/Live.com were doing cashback and Ebay had a 10% off coupon, my price was $630!)