Most A/C units are designed to run at normal ambient max of 95 deg. or approximately 115 deg inlet air. The problem is the roofs(and covers) can be much hotter than that. Most troubles on this forum are in the extreme conditions. 95+ deg. or extreme load conditions. Kids going in and out, r-2 insulation values, 90+ indoor temps at set-up, low air flow and leaking air flow. One doesn't have to look hard to find heat infiltration and loss in an RV.
Our new 5er 10-26-16
Days camped 2016 8