Thought that I might chime in on this one.
It is imperative that the fridge LP burner, flue tube and spiral baffle be cleaned ANNUALLY. If you read any of the new directions for these units, you will see that both Norcold and Dometic have sections to be completed every year for the cleaning and service and they will not honor any warranty claims without those pages complete.
That said, the cooling fans may work a little to keep the air flow on the condenser section but they really don't do much. Check out www.snydersrvrefrigeration
for a patent-pending, relatively cheap solution to the hot weather operational problems. The unit, when operating properly, should be able to maintain 45 degF when the ambient temp is 110 deg.
Other places to look are door seal leaks, interior light stuck on (this has a huge negative effect) and an often overlooked problem, a leaking drain hose or one that has had the bottom plug removed. This will cause a large amount of cold air leakage that will impede the operation also. Also remember that it takes at least 8 hours for an EMPTY fridge to get cool.
The air flow in the back of the unit and the cleaning are the 2 most important. If you are not getting enough heat to the refrigerant, the unit will not work properly. Also, if there is insufficient air flow on the high and low temperature evaporators in the rear of the unit, they will not be able to properly transfer the heat out of the interior of the refrigerator.