Wide range of responses at both extremes and everywhere in the middle. Our theory, with no reservation just pulling up to gate ask for a space, understand that if they say you can park in a tent space one night be thankful, if they are full move on. Start looking earlier, call ahead, plan more carefully. There is the other end of the spectrum where RV campers want to add a tent in an RV space and that doesn't always fly either. We are not big planners so take what we can get, or are willing to take any available if we run out of hoped for options sometimes no matter the reason. Parks and campgrounds aren't responsible for our poor planning or daily issues. We try to treat our hosts as we would like to be treated.
