I full time in my truck camper which is equipped with (2) 320 watt solar panels, (2) vents, (1) fantastic fan, and a huge sky light that opens. I also carry a Honda generator which I've never used. I camp in all types of weather.
My previous truck camper which I had for 13 years and used on average (6) months per year had identical solar, (2) vents, and (1) fantastic fan. It had a built in propane generator which I almost never used. Most hours on it were just running it monthly to keep it fit.
The biggest issue I have is condensation.....not lack of power. Condensation sucks in extended foul weather. It was huge in my decision recently to move south.
I'm certainly not qualified to know how to answer your question but my real life experiences say that maybe you meet in the middle, get (3) solar panels (if that's a big concern) and not forgo the vents.