We give the setup length and let them know that this includes A frame to end of caravan (24 feet). Hopefully that way there is no confusion on whether it will fit on a particular site. As @
expanda has said most will know that if you tell them that it is an expanda or will allow extra. I have seen parks that have "large sites" for big rigs, and a couple that have small sites where length would be an issue. AS long as you are clear what length you are giving them and that it is an expanda all should be good
. Only an issue around busy times when parks are trying to use every site and a site will only fit a 16 foot normal van and you happen to get that one.