Replace AC unit with Fantastic Fan.
I am considering purchase of an Axion, but would like to add a vent fan. I gather that the standard AC units and Fantastic Fans all mount through a 14X14 inch hole in the roof. So with a minor bit of rewiring I could ditch a perfectly good 100# AC unit and replace it with a 10# vent fan/skylight. While cooking, the vent fan would keep the smoke detectors from going off.
Although I live in California's hot central valley, I typically camp either on the coast or in the mountains. For the trip to either one, the dash AC should be fine. While stored outside between trips or while parked along the road, the automatic fan would run off the solar panel keeping inside temps below 120F (hopefully).
Finally, since the Fantastic Fan takes up 1/2 the roof space of the original AC unit, I may have freed up enough space on the roof to store a spare tire.
My question is: Is this a practical concept? Have I missed anything?