I am a believer in air flow in the back of the frig.
When we bought our current rig 4/13 the first thing I added was a 4" fan in the back of the frig cabinet. It plugs into the 120vac there and if we have shore power it runs.
Like this one:
https://www.walmart.com/ip/Optimus-F...l-Fan/25209563
It is pointed up and this Norcold 8cf frig we have now is the best operating frig we have ever had. It will get the frig part down to 32 degrees on the hottest day.
When we load it before a trip, (the top shelf will hold 18 12oz cans), I put 18 COLD cans of my afternoon beverage on the top shelf to help get it cooled down. Seems to help.
And yes, the rig must be level.
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's