Certainly hope that these ACs are NOT pulling in outside air to cool...and as mentioned above, the best of ACs will only cool incoming (room) air 20d when operating correctly.
If the fridge is in a slide, it definitely needs fan(s) to move the heated air away from the coils--I put 2 12volt computer fans in the upper vent that pull air out. If the fridge has a top vent, it is easier to move air thru, but still could use a fan in AZ heat. Some sort of shade in front of the fridge area will really be an aid to cooling in the fridge.
'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died