Thorsborne Trail - Hinchinbrook Island

Hi all,
I thought I'd ask some questions in regards to booking... and perhaps any future questions that I might have assuming I can get a spot on the trail.
I'm interested in walking this trail - flying in from Melbourne with 2 friends. I was thinking of aiming for June - August next year. I'm having a little trouble working out the booking system. As far as I can tell you can only book six months in advance which is fine, but just playing around with the site I can't see campsites as available (or applicable) for any date at all no matter what date is selected. I've attached a screenshot of what I'm seeing. The green dot at the top seems to indicate this is okay... if you adjust the date too far (past 6 months) it turns to a cross. But campsites available always has 'N/A'. So is this simply 'Not Applicable' because I'm booking the trail rather than individual campsites? When I progress forward, and choose 'Book site' it indicates that the number of people exceeds the maximum. I'm wondering if this means each of us have to do our own booking, or is there a seperate way to book for a party of walkers?
Thanks in advance for any advice!
I thought I'd ask some questions in regards to booking... and perhaps any future questions that I might have assuming I can get a spot on the trail.
I'm interested in walking this trail - flying in from Melbourne with 2 friends. I was thinking of aiming for June - August next year. I'm having a little trouble working out the booking system. As far as I can tell you can only book six months in advance which is fine, but just playing around with the site I can't see campsites as available (or applicable) for any date at all no matter what date is selected. I've attached a screenshot of what I'm seeing. The green dot at the top seems to indicate this is okay... if you adjust the date too far (past 6 months) it turns to a cross. But campsites available always has 'N/A'. So is this simply 'Not Applicable' because I'm booking the trail rather than individual campsites? When I progress forward, and choose 'Book site' it indicates that the number of people exceeds the maximum. I'm wondering if this means each of us have to do our own booking, or is there a seperate way to book for a party of walkers?
Thanks in advance for any advice!