I managed to survive at Road Atlanta for Nationals in 93* heat, 80% humidity, sitting on blacktop. Contrary to popular belief, the A/C CAN keep up, but there are some things you need to do to help it along. Things like:
1. Positioning the RV to manipulate how the sun hits it, if possible. For instance, we were parked in the pro paddock facing north. We rolled the awning out in the morning to keep the sun off the side of the RV
2. Keep the shades closed. Use vent insulation pads.
3. Close the bathroom sliding door and open the dump flap. Yes, this will limit you to staying mostly in the living area and out of the bedroom.
Even in this case, the living area was comfortable, and by the time the sun set, we could switch back to the vents and the bedroom/shower area was comfortable again. No point in cooling space youre not using...