I agree with Floyd about the danger of protruding windows with jalousies.
When closed I would also say they are not as tight as sliders though their full window, fixed screens generally do a better job.
When we had a trailer with jalousies all around, we never felt the need for air conditioning
because we had FULLY opening windows on four sides and always seemed to catch a breeze. Non jalousied windows never open more than half way.
As well most newer fiberglass trailers, possibly because of air conditioning
, rarely have opening windows on more than three sides; our Casita
16 only had opening windows on two sides.
Another small feature is that no thief is easily coming thru a jalousied window, though we never worry about problems like that when camping.
Our jalousied trailer was 28 years old and the window mechanisms all worked. I found that impressive.