We go back and forth. Started w an exterior cover (most heat effective) but after it went missing from winter storage yard switched to inside curtains. Have not found anything we really like yet. That is anything that does not take space and require time to put up but yet really blocks the sun. The only issue I had with the exterior cover was when the van was dirty and scratching the paint with the magnets holding the cover.
Really like the side screens on yours. Let see pics when you get the powered .... maybe you can also add a rain sensor.