Every one here that is still trying to justify using a contractor generator for camping based on cost (oh, poor little me, I can't afford to do it right) are still missing the point. Camp out in the boonies where no one is within 500 feet; use what you want; and if that's your plan, more power to you. There have been a variety of good suggestions on how to mount and secure it. But camp in a campground anywhere near others; you WILL make a lot of enemies. I'm sorry to break that to you, but it's still the truth. Even TomG2 has now admitted that he wouldn't want a generator running near his head while trying to sleep.
Just like no one wants to listen to a diesel pusher sitting next to them idling all day long in a campground, no one wants to hear a loud generator running next to them either. 68db is TWICE as loud as 65db. Just what is it about common courtesy that no one seems to grasp? Of course I suppose that you could just crank up your outdoor stereo loud enough to drown out the generator, right?
I give up.
