Curt, I think you have it backwards:
When your AC is in NORM mode - you are drawing in warm, humid, outside air and the A/C is trying to cool.
When you're in MAX mode, you are recirculating cool, dehumidified inside air and cooling it.
Your dash AC unit should be able to deliver a 25 -30 degree temperature delta.
If you're drawing in 100 degree outside air, the best you'll see out of the vents will be about 70 deg
If your recirculating air, and the AC is drawing in 80 degree air from inside the cab, you should see about 50 deg air coming out the vents.
ALSO - Like Curt mentioned, In our ole Class C, we made a nice thick privacy curtain. It would be warm in the back, but nice and cool in the cab area. (also warm heat in the winter)
2001 Coachmen Mirada (Ford F53 6.8L V10) - Toad 2003 Saturn Vue
It won't do MACH 2, but I can get a sandwich and take a pee.