@Kimberly1469
Both listings are shown in your profile, which can be seen by clicking on your profile picture in the listing.
So you can mention in each listing there is a second tent and people need to click on your profile photo to find the other listing
Your profile:
https://www.airbnb.com/users/show/441194402
Another way is to create a third listing with both tents in it for a larger group to book, being the main listing and then link the individual listings to it to prevent double bookings. It works for rooms in the same building, not sure it will also work for tents on the same camping.....
Linking calendars for multiple Airbnb listings:
https://www.airbnb.com/help/article/1864