I saw a trade stand at BUSFEST a couple of years ago selling them, along with loads of other overlanding gear, I remember the awning had a huge area of cover, you probably can’t open tailgate fully though?
I guess most fit on an expedition style roof rack like front runner flatdog ARB,they all make racks for a transporter so it should be a easy fit,
Talking of Awnings, I’m going to fit a shower cubicle to our van in a few months so that should be interesting..I think it should work out