Space inside the caravan is limited, and the inside might get a bit too warm to be comfortable during long summer days.
The obvious solution is to install a caravan awning.
Caravan porch awning: Light-weight conctruction, easily mounted, perfect for the travelling caravanner.
Caravan full awning: More space, suited for longer stays in one place. They are available either with a breathable acrylic material, or PVC-backed fabric for permanent use.