Reddit mentions of Maxxair 0007000K MaxxFan Deluxe Fan with Remote and White Lid

I wanted these features:

• reversisble - blow out in the heat and pull in gently in the cold
  
• 10-speed rather than three for finer control and the ability to access a very low speed. Allows for minimal power use and constant use in all seasons for humidity control
  
• thermostat for varying fan speed automagically. I actually don't use this much because it can turn the fan off when it's cool and I want continuous operation
  
• built-in hood so I could run it in the rain without a ginormous doghouse cover on the roof. My van is already 8.5' tall.
  
• remote because my fan and bed are on opposite ends of the 12' living space. I keep it in the console when driving in case I forget to lower it before departure (safe, but noisy).
  
  This led me to the MaxxFan deluxe. It was expensive but completely worth it IMO.
  
  It has a design feature I didn't realize when I bought it. The fan sits down into a mount which is fixed to the roof and sealed. If you need to remove the fan for any reason you can lift it out of the mount and repair/replace/whatever in minutes. This would make repairs or warranty replacement much less of a hassle. I don't know if Fantastic does this or not. Perhaps a FF owner can chime in.
  
  I saved money on this kind of thing by starting camelcamelcamel watchlists on items I knew I'd need for the build. In this example, the fan I bought has varied by $51 dollars in the past year. CCC will alert you when the price drops to a point you specifiy.
  
  I also saved more than $40 on a foam mattress I wanted this way.
  
  Edited to add: I think the Maxx or FF are both excellent fans. Folks in smaller vans could probably do fine with a 3spd manual fan with no cover. There are also marine style mushroom and flat-ish vents with fans in them. There are also wind-powered vents that require no electrons at all. These latter types might fit under solar panels for a neat install.

I think someone here was talking about rain guards for your front windows, so you can crack them while its raining.

https://www.amazon.com/Auto-Ventshade-92077-Ventvisor-Deflector/dp/B000182EUA/ref=au_as_r?_encoding=UTF8&Make=Ford|54&Model=E-150%20Econoline|646&Year=1998|1998&ie=UTF8&n=15684181&newVehicle=1&s=automotive&vehicleId=1&vehicleType=automotive

Then you can get a covered fan vent for the top of the van.

https://www.amazon.com/Maxxair-0007000K-MaxxFan-Deluxe-Remote/dp/B003ZOF09Y?ie=UTF8&*Version*=1&*entries*=0

With those two, you would be pulling air from the outside through the windows, and pushing the air out through the ceiling vent.