No concerns about weather blowing in? Snow melt issues?
I too have maxair covers and have had rain blow in when camping. At home the camper 'points west' - as in the open end of the vents aim west, where the weather comes from.
And we do get snow here, and it blows (and I live in a windy high area - if I don't anchor swingsets, canoes and such they blow across the yard 3-4 times a year).
I keep em closed and in ~4 years haven't seen/smelled anything objectionable.
Jill & Chris, Wills (15) Evie (13) & Toby our collie (6)
2011 Grey Wolf 28BH
2013 Chevy K1500 Crew w/ Reese StraitLine Dual Cam
Nights camped 2011: 11 2012: 18 2013: 12 2014: 12 2015: 13 2016: 36