The MaxxAire window vents work great for the sliding windows. I rarely close mine except when using the heater. Even then one is left partially open. The MaxxAire vent cover on the roof is also great. "Nuestra Casita" has been through absolute deluges with open roof vent and windows and not a drop of rain was able to find it's way inside. The only complaint I have is there is not a size for a Casita
bathroom window. The other windows all have the window vents.The advantage to sliding windows is being able to close them so wind (and dust) can't come inside. Louvered windows historically leak wind. I've had many mobile home customers who had an intense dislike for them. They leaked air in the summer when air conditioning
and in the winter when attempting to heat.
Either way, it appears as if you loves 'em or you hates 'em. At least you've got two choices when "skinnin' the cat".
For my money, controlled ventilation is necessary. Contending with heat build-up and inadequate air flow is not my idea of enjoyable camping.
& Ann K.