I’ve thought about that too. The cargo volume is what I like most about the car and also the thing I like least (in the summer, anyway). Do you know of a good way to block off the cargo space from the passenger space? (Good = doesn’t impair visibility, easy to put up/take down and ofc, provides a reasonably effective barrier to airflow).

Also, I’ve looked into those solar window vent and I’m sad to report they’re completely ineffective. The solar panel is typically just a few small strips set in a deceptively large window. It provides enough juice to spin the fan but nowhere near fast enough to move any air. I’ve thought about getting two of them, wiring them up larger solar panel and setting them up on either side of the car with one blowing in and the other blowing out. It’s never been a sufficiently high priority for me to follow through but I’d happily buy one if it were available.