Lots of factors affect cooling.
- Is the RV in direct sunlight?
- Is there any way to shade at least the side the fridge is on?
- How old is the RV/Fridge?
- How much has it been operated off level?
- Running off level doesn't necessarily result in immediate catastrophic failure, but the more it happens, the more damage that's done.
- Are the outside vents top and bottom clear and free of any debris?
- As others have suggested, fans in the outside compartment may help.
- Fans inside the refrigerator can help with even distribution.
It's not at all uncommon to have trouble keeping it below 40 with gas absorption refrigerators. Shouldn't be a problem, but more often than not it is, especially in the heat of the day. Many people resort to putting a jug or jugs of water in the freezer at night and moving them to the refrigerator during the day. Again, shouldn't be necessary, but may help. I have to say, I don't miss RV style fridge. When we got our current TT with residential refrigerator, I was worried about batteries lasting during travel, but that hasn't been an issue so far.