There is a POG member who has been silent here. He has the answer for getting performance out of Cruise Airs when the heat radiating off the roads is capable of shutting the units dow,

Jim Shoen has added misters to his condensing units tied into a pressure switch and his water system. When the pressure in the condensing unit builds because it is too hot for condenser cooling the misters come on and spray water across the coil.

This is a very effective way to make Cruise Airs work if the coach does not have roof airs.

Jim??? Where are you?