Hi Brightonbelle.
1/ I connect the awning “tunnel” to the wind out awning channel using a kador strip and figure of 8 connectors, something like this:
View attachment 96183
2/ driveaway awnings are designed to allow you to disconnect the “tunnel” and drive away. The good thing about having the wind out awning wound out and connecting the awning to that, rather than it being tight to the van is that when you drive away and return you don’t have to be at the exact distance to maintain the tension in the tunnel, you just have to be straight because you can wind the van awning in/out as necessary.
3/ this awning isn’t designed for people to sleep in as there’s no inner bedroom attachment for it or flaps at the bottom edges to stop draughts, mud, rain coming in. In summer it gets hot and although there’s 3 vents there’s now windows that can open. If you’re quite hardy, not too tall and the weather’s okay you could. I slept in our old one once when I had a real hum dinger of a row with my hubby and I “threw my teddy out of the van, crushed up all my crayons“ and had a right strop on. But then I can sleep anywhere and am very comfy on hard ground. You can get awnings that Are designed to sleep in, although they’re much more expensive that this basic one.