Hi Raye
I'm not too sure where you're located, but have a Google search for van awning or if you're looking for something a little more comprehensive, search batwing or 270° awning and it should come up with some results in your region
I wonder if a DIY build would be possible for something like this.. Something attached across the roof racks or straight to the roof, made with tarp or similar. Could even make something that attaches to struts on the back doors if you don't need to cover a lot of space.