I can't believe there isn't a window for the top bunk. I find it gets warm up there when my 5 year old is sleeping for a few hours. I generally leave the curtain open after we go to bed so they get lots of fresh air.
2010 Jayco JayFeather 213 EXP
2016 Ford F-150, 4x4, 3.5L ECOBOOST, MaxTow, Supercrew, 6.5FT, 3.55 axle