Best ways to keep RV cool inside in desert climate

While driving we turn on all three AC units and pull the shades. Sitting the same way but add window awnings out and front window covered too. I had temp coat put on the roof and it did a great job too. More then just the white fiberglass alone. Mostly white sides with graphics painted darker. My sidewalls were 50 degrees cooler then my buddies dark coach in the afternoon.