Do you have a circulating fan of some type inside? When loaded with stuff you will not get much natural convection past the cooling fins inside, and even a small circulating fan will improve things. I have a computer fan wired into the hot side of the light switch so it runs as long as the fridge is on. It helps cool down faster and returning to cool after opening, it uses very little power and is one of the best mods I have done. Even in summer temps here in the SoCal desert it will maintain in the safe zone for food on propane, which puts out more btu than the electric heater thus more effective.
Check and be sure the fridge is properly baffled by looking up from the outside panel. There should be only around an inch of space between the coils and the wall to create the chimney effect. If not, you will need to fill it somehow.
2007 Expedition EL 4x4 Tow pkg
1981 Palomino Pony, the PopUp = PUCampin! (Sold)
2006 Pioneer 180CK = (No more PUcampin!):B
Me:B DW:) and the 3 in 3 :E
DD:B 2006, DS 😛 2007, DD :C 2008