Considering the vast majority of campground power (in my experience) is somewhere between somewhat run down and dilapidated, the prospect of a campground full of granola-mobiles pulling max juice out of an old system, just trying to let the smoke out of them, is not a very attractive scenario.
Maybe if you keep it to cool weather when no one is running their air conditioners and in the summer you sweat at night while everyone else is using their AC, it would work.
And by “you” I don’t mean YOU personally. But the royal “you” all.