Thanks for the info. We were in a bit of a panic as we were moving on and not expecting any major RV service centers for a while. Today's lesson: RV businesses have no service staff on Saturdays. GNR was kind enough to lend us a step ladder so we could try on a couple hoods and we found the MaxxAir fits nicely, even with the solar panel
in close proxinity. For now we will carry it inside the Trill and just pop it over the vent at night if it looks like rain. In fact, that's what's over my head now as I type this.
For the windows, MaxxAir does make window vents but no one had them in stock so instead we covered the window with some no-see-um screening and tied it tight around the window frame with some twine. That'll act as a rain screen for now, but again, we'll have to take it off while driving. (BTW, our first encounter with no-see-ums tonight - nasty little creatures they are. Any tips on what to do about those?)
If I can find a MaxxAir vent in Ontario I will buy it.
As for airflow, I already bought the 10W 4.7 ohm resistor and plan to mod the fan soon. I plan to bypass the 0 position on the 0-1-2-3 switch with the resistor to make it LOW-1-2-3. There is already an IN-OFF-OUT switch so we will use that to turn the fan off. That's the plan so far anyway.
I removed the MaxxAir hood's screen to increase the airflow. The FF already has a screen anyway.
At least we can now sleep in peace!