fan placement
The fans are to remove the heat from the coils, it has nothing to do with your temp setting of 4 or with the outside temps. If a unit is install in the RV's cabinet with a correct air flow up through the coils to remove the heat of your cooling unit, not the cavity, will cool the insides down quickly shuting off the heat source, which in turn allows the fans switch to cool down shuting off. If the heat is not being removed quickly, the inside temp setting as you state #4 would still be reached first shutting off heat source, but the outside metal, the tubes, cavity area and the fan switch area may not have cooled down because of the slow air flow removing of the heat, because all the cooling air flow is going across the needed areas.
If you want to have the fans to cycle off and stay off longer you can relocate the mounting location, but is all the hot heated air that needs to be removed being removed. Are you more worried about fans running longer or having a nice an cold maintaining refrigerator, we feel the cold is better.
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