You could always tell them "It's a 24" and hope.. I know they used to be less critical before one of the campgrounds closed for flooding.. I'd try to negotiate your way in, reminding them that trailer alone is easy to maneuver (practice backing up first..) and with truck separated it will fit into almost any of their spaces...
Congratulations, and enjoy the new home on wheels!
In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference...