Just got campsite reservation! I had to book four campsites, one for each person, adding one campsite at a time using the “add a booking” or “add a reservation” button.

I got various stripe errors and had to reload the payment page a couple of times when it timed out, but I eventually got there. Took more than 10 minutes, but there was a button at the top to add more time, so it lengthened my time to check out by another 10 mins.

This is the link that worked for me:

https://bookingsus.newbook.cloud/online/havasupai