Good afternoon @Faye172
I am sorry for the confusion that some of my fellow host contributers may have provided here and they might not just be up to date on this question.
You can actually list a vacant campsite now on Airbnb. When you list your listing, choose “Unique Space” under “what is most like your place”. You can then choose “Campsite” from the second drop-down menu, Property type. This was also confirmed by a fellow Airbnb Comunity Expert friend of mine who discussed this with Airbnb.
Happy hosting @Faye172
David
David
Superhost Ambassador ~ Host Club Community Leader ~ Community Expert ~ Experienced Co-Host