I know this is very true with the big motorhomes. I guess money talks haha... You probably can't tell if it is the motor or the generator running in those things.
In my case my generator is in plain view sitting on my truck tailgate so I would be spotted and pistol whipped right off the bat hehe...
My problem is I like to follow the rules the best I can. If the rules get to strict then I just move on to another spot somewhere.
I think the folks out West probably get away it more then we do here on the East side of the US. Things are really stretched out on the west side of the Mississippi. There is definitely more Dispersed camping out West. Here on the East side the public camp grounds seems to have all the rules in place.
Roy Ken