The tent looks like the one I saw but it also looks a bit different as well? The young man who owned it said it was a 2 person Big Agnes, that's all I can remember about it, but it sure looked good.
When I camped on a campsite I just turned up, no problems at all, everyone one most helpful, until the very end at Kirk Yetholm! I finished the walk late and arrived at the campsite entrance at 9.45 pm. The entrance notice said to phone their number if late which I did and a lady told me that they do not accept walk-in hikers, so I was turned away.
No matter though, I went back to the pub near the Pennine Way sign and the landlady suggested I should just camp on the village green, which I did, it was free and as she said, it's allowed. It's Scotland!
She said I could use the pub toilet and invited me into breakfast the next morning, £10 per head.
If you experience a camping site problem I'm sure it's going to be at the beginning of the hike. You can camp at Crowden and as far as I know the next campsite is at Cowling, which is an excellent one. The owner brews his own beer!
I believe there may be a pub campsite on the A62? You have to turn right at the road and walk about half a mile to it. I think it's called the Carriage House? If you choose to divert into Marsden though as I did and then return to the Pennine Way you will miss the Carriage House, by then it will be behind you. Which is why I wild camped that night.