This past weekend, there were campers in the overflow area with several types of generators. Two class A diesel pushers had the Onan whisper Quiet diesel sets and thay were very quiet. Once class B with a gas Onan 2800, one trailer with a Champion 3600 and two trailers with Honda EU2000i's.
You could hear the Champion several sites away over the Hondas that were 1/2 the distance. Next loudest was the Onan 2800. The diesel sets (while some on the order of 8 to 10 kW) were slightly louder than the Hondas. One was a pair of EU2000i's in parallel.
Quiet hours were from 10PM to 6 AM and they all shut them down promptly at 10 PM.
I would look for the Honda EU series on Craigslist and get them used rather than the new contractor grade generators.
My pair of Honda UE2000i generators have never failed me and are well worth the money.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot