The AC duct work is in the ceiling, the roof is the hottest part of the unit, the cold air has to cool the ceiling before it cools the space. I wish they had the ceiling chill grills to be able to cool the space instead of the ceiling. It might help.
2015 RAM 3500 SRW, 4X4, 3.73, 6.4 Hemi
2016 Eagle 338rets, Maxxis Tire Upgrade, Slide Toppers, Backup Camera, 2 - 15K AC units
Blue Ox Sway Pro Hitch, 2000 lb. Bars